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A Quick Guide to Fixing the Stop C00002lA Fatal System Error

Stop C00002lA Fatal System Error- What is it?

C00002lA Fatal System Error is a blue screen of death error that may occur when you start your Windows NT 4.0 based computer. This error causes the screen to turn blue and the system also shuts down.

The stop C000021A error message is displayed in the following format:

Stop c000021a {Fatal System Error}
The session manager initialization system process terminated unexpectedly with a status of 0xc0000017 (0x00000000, 0x0000000) The system has been shut down.

Error Causes

The stop C000021A error occurs when either Crsrss.exe or Winlogon.exe fails. When the Windows NT kernel identifies that either of these processes has failed, it stops and the error code stop C000021A appears on the computer screen.

Here are some of the underlying causes for the stop C0000021A error:

  • The incompatible third-party program
  • Hard disk issues
  • Service pack installation has failed
  • Mismatched system files have been installed
  • Bad and invalid registry keys

Further Information and Manual Repair

To resolve the stop C000021A Fatal System Error on your PC try the following solutions:

  • Remove Incompatible Third Party Programs

If the error occurred after you recently installed a new program, then it is advisable to remove that program. The error occurs due to the incompatibility of the program.

To remove the program go to the start menu and click on the control panel. Now click on Add/Remove Program tab and double click on the program name that you recently installed and remove it from the list.

Once removed, not reboot your PC. Reinstall a compatible program and run it. It is most likely to resolve the issue. However, if the stop C000021A error still occurs, then it means the problem is critical. It is related to the registry.

  • Repair and Restore the Registry

This procedure is slightly long and tricky.

To try it, you need to be technically sound. Here’s what you have to do: first create a parallel installation of Windows NT.

Start your PC to the parallel installation and then open the Registry Editor. On the Registry Editor’s Windows menu click HKEY_LOCAL_MACHINE on Local Machine and then click Load Hive.

Now type the path %systemroot%system32configsystem into the System hive of the prior installation. Then click open. Here you will be prompted to enter the name of the key, type TEST.

Note the setting for the current DWord value in the preceding registry key. This is 0x1 and is denoted by CURRENT:Reg_Dword: 0x1.

This value indicated that the Current Control Set for your original Windows NT installation corresponds to ControlSet001 in this window. Now if the value is 2, it indicated that the Current Control Set corresponds to ControlSet002.

Now locate the following registry key:

HKEY_LOCAL_MACHINETESTControlSetXXXControlSession Manager. XXX is the Current Control Set Value. And delete any pending file rename operation entries. Then click TEST hive and then click Unload Hive. After that again repeat the process, open the registry menu and click load hive, here type the path %systemroot%system32configSoftware to the Software hive of the prior installation and then click open.

Now you type TEST 2 when you are prompted for the name of the key. Remove any pending file rename operations entries in the following registry keys:

HKEY_LOCAL_MACHINETEST2MicrosoftWindowsCurrentVersionRunOnce

HKEY_LOCAL_MACHINETEST2MicrosoftWindowsCurrentVersionRunOnceEx

Now click TEST2 hive and then click unload hive. Quit the Registry Editor and then restart your original installation.

This will resolve the stop C000021A error.

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Middle mouse button is not working
If you suddenly find the middle mouse button not working as you use it on your Windows 10 computer, then you’ve come to the right place as this post will provide some suggestions that can help you fix the issue. This kind of problem can affect your experience in using your computer as the middle mouse button helps you in scrolling through long web pages and screens with a lot of data. So if that stops, you will end up using your keyboard instead which is kind of a hassle compared to using the middle mouse button. It is possible that this problem could have something to do with either the hardware or software. To isolate the possibility of a hardware failure, you can try to connect the mouse to a different computer and see if it works just fine there or if it still has the same problem. If the mouse works properly on a different computer, then the issue is software-related. It is possible that a software update, especially gaming software, could have been misconfigured in a way that the middle button does not respond like it’s supposed to. To resolve the problem, you might want to try reinstalling or updating the mouse drivers or run the Hardware and Devices troubleshooter. You can also install OEM-specific mouse drivers or modify some entries in the Windows Registry.

Option 1 – Reinstall or update the Mouse driver

The problem may be caused by a corrupted or an outdated mouse driver. To fix it, you have to update or reinstall the mouse driver. How? Follow these steps:
  • Open the Devices Manager from the Win X Menu.
  • Then locate the Mouse and other pointing devices and right-click on the mouse driver to open the Properties.
  • After that, switch to the Driver tab and click on the Uninstall Device button.
  • Follow the screen option to completely uninstall it.
  • Finally, disconnect the mouse and plug it back in to reinstall the mouse driver.
Note: You can install a dedicated driver on your computer in case you have it or you could also look for it directly from the website of the manufacturer.

Option 2 – Try running the Hardware Troubleshooter

The next thing you can do to fix the problem is by running the Hardware Troubleshooter. Although it won’t make much of a difference, there’s still a possibility that it could automatically fix the problem with these function keys. To use it, refer to these steps:
  • The first thing you need to do is click on Start and then on the gear-like icon to pull up the window for Settings.
  • After opening Settings, look for the Update and Security option and select it.
  • From there, go to the Troubleshoot option located on the left-hand side of the list.
  • Next, select Hardware and Devices from the list and open the Troubleshooter and run it. Once it is doing its job, wait for it to complete the process and then restart the system.
  • After the system restarts, check if the problem’s now fixed. If not, refer to the next option given below.

Option 3 – Try to install OEM specific mouse drivers

Aside from updating or reinstalling the mouse drivers, you might also want to try installing OEM-specific mouse drivers. When you install Windows, it will use a generic driver for all its components. The disadvantage of generic drivers for the mouse is that it limits its functionality. In fact, some also configure the middle mouse button to respond to specific action which does not work without the correct drivers. In such cases, you need to visit the website of your computer’s manufacturers to download and install the latest drivers and then open the software and configure it the way it was before. Keep in mind that some OEMs also offer gestures, so you also have to check on that.

Option 4 – Try to modify some entries in the Registry

If a Windows Update is the one that caused the problem, you could correct it by making some modifications in the Registry but before you proceed, make sure that you create a System Restore point first.
  • Tap the Win + R keys to open the Run utility.
  • Then type “Regedit” in the field and hit Enter to open the Registry Editor.
  • Next, navigate to this registry path: HKEY_CURRENT_USERControl PanelDesktop
  • After that, double click on the “WheelScrollLines” entry on the right pane to open its Properties.
  • Now change its value data to “3” and exit the Registry Editor and then see if the issue with the middle mouse button is fixed or not.
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Change Legacy to UEFI without reinstalling
There are some new generation motherboards for laptops and PCs that bring in support for both the Unified Extensible Firmware Interface or UEFI as well as the Basic Input Output System or BIOS. The main advantage of UEFI over the traditional BIOS is the fact that UEFI supports a hard drive that has a capacity of more than 2 terabytes. However, the disadvantage of UEFI is that it only supports the x64 Windows operating system versions and that the hard drive is supposed to use the GPT structure. So if your PC is compatible with and supports UEFI and you want to change from Legacy to UEFI, then you’ve come to the right place as this post will guide you on how you can exactly do that without having to reinstall it. There are two ways to change Legacy to UEFI. You can convert MBR to GPT using either the built-in utilities in Windows or using the Recovery Environment. Before you proceed, make sure that your computer fulfills the following prerequisites:
  • Your PC’s motherboard should support both Legacy and UEFI.
  • Your PC should be running at least the 1703 Windows 10 version or newer on an MBR partition.
Once you’ve made sure that your computer covers the aforementioned prerequisites, refer to the given options below.

Option 1 – Convert MBR to GPT via Windows built-in utilities

  • In the Windows Search box, type “command prompt” and from the search results that appear, right-click on Command Prompt and select the “Run as administrator” option.
  • After that, execute this command: exe /convert /allowfullOS
  • Now, wait until the process is completed since you can track its process on your screen.
  • Once it’s done, go to Settings > Update & Security > Advanced Startup options and from there, click on Restart Now. This will restart your computer and give you advanced options.
  • Next, select Troubleshoot > Advanced Options where you will see further options including System Restore, Startup Repair, Go back to the previous version, Command Prompt, System Image Recovery, and UEFI Firmware Settings.
  • Now select the UEFI Firmware Settings. This will take you to the BIOS. Boot Mode is typically available under Boot > Boot Configuration. Once you’re there, set it to UEFI and then save the changes you’ve made. After that, your computer will restart.

Option 2 – Convert MBR to GPT via the Recovery Environment

  • When the message appears on your screen while running Windows Setup, you need to tap the Shift + F10 keys to open Command Prompt.
  • Make sure to run Command Prompt as admin and then execute this command: exe /convert
  • After that, wait until the process is completed. When it’s done, you have to go to the BIOS just like in the first given option above.
  • As mentioned, you can usually find the Boot Mode under Boot > Boot Configuration. Once you’re there, set it to UEFI.
  • Now save the changes made and exit as your computer will restart.
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Windows got stuck on Preparing Windows screen
You might have experienced a situation when you restarted your Windows 10 PC after an upgrade and you tried logging into your account but only a screen with a message saying, “Preparing Windows”. If the screen only stays that way, this indicates that Windows 10 is trying to complete the upgrade or waiting for some files to load up so that you can use your account. Some users also reported that when they tried logging into their accounts, they also get the same message on their screens. To resolve this issue, read on as this post will show you what you can do if your Windows 10 PC is stuck on the “Preparing Windows” screen. A lot of users have tried logging back into their account once more but to no avail as the same screen still greets them. And even when they tried the Ctrl + Alt + Del combo, it still didn’t work. This only goes to show that your account might somehow be corrupted.

Option 1 – Try booting your PC into Safe Mode

The first thing you can do to resolve the issue is to try booting your computer into Safe Mode and then log in using an Admin account. If it seems like your admin account has caused the problem, you need to create an admin account first and then log in after you reboot into the account and then log off. After that, restart your PC normally and check if the problem’s resolved or not. If not, refer to the next given option below.

Option 2 – Try to repair your corrupted profile via Registry

In this second option, you can try to repair the corrupted profile using the Registry but before you proceed, make sure to create a System Restore Point and then follow the steps below.
  • Tap the Win + R keys to open the Run dialog box.
  • Then type “regedit” in the field and hit Enter or click OK to open the Registry Editor.
  • Next, go to this registry key: ComputerHKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersionProfileList
  • Once you’ve opened the registry key, you should see a list of all the user profiles on your computer. Now click on each S-1-5 folder and look for the “ProfileImagePath” entry and double-click on it to check which user account it is related to. You will see a path like “CUsersACK” where “ACK” is the username.
  • You should know which among the user account is corrupted. Just look for a key named “RefCount” and change its Value data to “0” and click OK. And if it isn’t available, simply right-click on the right pane and create it.
  • After that, double click on the key named “State” and make sure that the Value data is “0” and click OK.
  • Exit the Registry Editor and restart your computer to apply the changes made.

Option 3 – Try running the System File Checker

System File Checker or SFC is a built-in command utility that helps in restoring corrupted files as well as missing files. It replaces bad and corrupted system files with good system files that might be the cause why your screen is stuck at “Preparing Windows”. To run the SFC command, follow the steps given below.
  • Tap Win + R to launch Run.
  • Type in cmd in the field and tap Enter.
  • After opening Command Prompt, type in sfc /scannow
The command will start a system scan which will take a few whiles before it finishes. Once it’s done, you could get the following results:
  1. Windows Resource Protection did not find any integrity violations.
  2. Windows Resource Protection found corrupt files and successfully repaired them.
  3. Windows Resource Protection found corrupt files but was unable to fix some of them.

Option 4 – Try to repair hard disk errors using the Chkdsk utility

You can also run the Chkdsk utility to resolve the problem. If your hard drive has issues with integrity, the update will really fail as the system will think that it’s not healthy and that’s where the Chkdsk utility comes in. The Chkdsk utility repairs hard drive errors that might be causing the problem.
  • Open Command Prompt with admin privileges.
  • After opening Command Prompt, execute the commands listed below, and don’t forget to hit Enter right after you type in each one of them.
  • chkntfs /t
  • chkntfs /t:10
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Fix WHEA_UNCORRECTABLE_ERROR, 0x00000124
Any modifications in a computer, either big ones or small ones can definitely trigger some errors which is why you have to be careful when you modify the system setting. One of the errors you might encounter when you’ve modified your computer is the WHEA_UNCORRECTABLE_ERROR 0x00000124 Blue Screen Error. According to the error data provided by the Windows Hardware Error Architecture or WHEA, aside from system modifications, you could also encounter this error if your computer has a hardware failure which could be due to a hard drive, RAM, or any other hardware component. In most cases, it is related to physical hardware failures which might have something to do with defective hardware, heat-related, memory as well as a processor that is starting to fail or has already failed. To fix the WHEA_UNCORRECTABLE_ERROR 0x00000124 Blue Screen error, here are some suggestions you have to check out.

Option 1 – Try to perform System Restore

Before you further troubleshoot the problem, you might want to perform System Restore first as the BSOD error might be caused by system modifications. Thus, to undo them, you can use System Restore. Run it using these steps:
  • First, tap the Win + R keys to open the Run dialog box.
  • After that, type in “sysdm.cpl” in the field and tap Enter.
  • Next, go to the System Protection tab then click the System Restore button. This will open a new window where you have to select your preferred System Restore point.
  • After that, follow the on-screen instructions to finish the process and then restart your computer and check if the problem is fixed or not.

Option 2 – Try disabling Overclocking

If overclocking is enabled, you might have to disable it as some users reported that the WHEA_UNCORRECTABLE_ERROR 0x00000124 error started to appear right after overclocking. To disable it, follow the steps below.
  • Go to the Start Menu and open Settings.
  • Next, select Update and Security and go to the Recover tab.
  • From there, click on Restart now in Advanced startup. This will restart your computer.
  • Once you’re in the Advanced startup, go to Troubleshoot and then select the Advanced Options.
  • From there, select the UEFU Firmware Settings.
  • Now click on Restart. Once your computer has restarted, it will automatically open BIOS.
  • From the BIOS, go to the Advanced tab and navigate to Performance and then look for Overclocking.
  • Once you’ve found Overclocking, make sure that it is disabled. If it’s not, then disable it and then save the changes made by tapping the F10 key.
  • Start your computer normally and check if the WHEA_UNCORRECTABLE_ERROR 0x00000124 error is now fixed.

Option 3 – Check your computer’s cooling components and make sure that they are working

It is a known fact that an overheated PC causes system slowdowns and even Blue Screen errors like WHEA_UNCORRECTABLE_ERROR 0x00000124. To fix it, you need to check your computer’s cooling components to see whether they’re properly working or not. Then make sure that you clean them up including the fan and other hardware from dust and other debris.

Option 4 – Use the Windows Memory Diagnostics

Since the problem has something to do with the physical RAM, you need to use Windows Memory Diagnostics. To run it, refer to these steps:
  • Tap the Win + R keys to open Run and type exe and hit Enter to open the Windows Memory Diagnostic Tool.
  • After that, it will give two options such as:
    • Restart now and check for problems (Recommended)
    • Check for problems the next time I start my computer
  • Once your computer has restarted, perform a basic scan or you could also go for the “Advanced” options such as “Test mix” or “Pass count”. Simply tap the F10 key to start the test.
Note: After you select the option, your PC will restart and check for memory-based issues. If it finds any issues, it will automatically fix them.

Option 5 – Update or rollback or disable concerned device drivers

To fix the WHEA_UNCORRECTABLE_ERROR 0x00000124 error, you can also try to roll back, or update, or disable the concerned device drivers.
  • Open the Devices Manager from the Win X Menu.
  • Then locate the device drivers particularly the ones that are under the sections of Keyboard, Mouse, USB, and HID Drivers.
  • Next, right-click on them to open the Properties.
  • After that, switch to the Driver tab and click on the Uninstall Device button.
  • Follow the screen option to completely uninstall it.
  • Finally, restart your computer. It will just reinstall the device drivers automatically.
Note: You can install a dedicated driver on your computer in case you have it or you could also look for it directly from the website of the manufacturer. On the other hand, if you have just updated your device drivers then you need to roll back the drivers to their previous versions or disable them.

Option 6 – Try running System File Checker or SFC scan

You could also run System File Checker or SFC scan to fix the BSOD error. It is a built-in command utility that helps in restoring corrupted files as well as missing files. It replaces bad and corrupted system files with good system files. To run the SFC command, follow the steps given below.
  • Tap Win + R to launch Run.
  • Type in cmd in the field and tap Enter.
  • After opening Command Prompt, type in sfc /scannow
The command will start a system scan which will take a few whiles before it finishes. Once it’s done, you could get the following results:
  1. Windows Resource Protection did not find any integrity violations.
  2. Windows Resource Protection found corrupt files and successfully repaired them.
  3. Windows Resource Protection found corrupt files but was unable to fix some of them.
  • Reboot your PC.

Option 7 – Try to disable the Digital Driver Signature Enforcement

  • Reboot your computer from the Start menu.
  • Then select the option while pressing the Shift key. This will open the Advanced Boot menu.
  • From there, click on Troubleshoot and select Startup Settings.
  • Now select the “Disable driver signature enforcement” option using the arrow keys on your keyboard and then restart your computer normally.
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How to Fix Error 421

What is the Error 421?

Error 421 is a common SMTP (Simple Mail Transfer Protocol) Outlook error message. MS Outlook is one of the best and popular email applications widely used by PC Windows users for sending and receiving emails within and outside workplaces. It is most commonly used in offices by professionals for faster communication. This error may occur while sending and receiving emails on the server. The error 421 messages is displayed in either of the following formats:
“An unknown error has occurred: Server error 421” "Could not send your message. Error 421" 421 4.2.1 : (DYN:T1) http://postmaster.info.aol.com/errors/421dynt1.html 421 4.3.1 Out of disk space for temp file 421 4.3.2 All server ports are busy 421 Downstream server error 421 Fork failed 421 Greylisting enabled, please try later “An unknown error has occurred. Subject ‘Testing’, Account: ‘pop.charter.net’, Server: ‘mail.charter.net’, Protocol: SMTP, Server Response: ’421 Message rejected’, Port: 25, Secure(SSL): No, Server Error: 421, Error Number: 0x800CCC67”

Solution

Restoro box imageError Causes

Some common causes for this critical Outlook error are:
  • PST storage size exceeds 2GB file size
  • Improper ISP settings
  • Slow internet connection
  • PST file corruption
  • Trojan attack and viral infection
This is a critical Outlook error that should be resolved timely. If you delay, it may cause you a great deal of inconvenience. The error code 421 hampers your ability to access your email account, send and receive emails, add new contacts, view emails, calendar entries, and journals. In other words, it just brings your email activities to a standstill locking you out of the account.

Further Information and Manual Repair

To resolve this error code on your system, you don’t always have to hire a professional or call the network personnel to do the job. It may be a critical error but the good news is that it is quite easy to fix. Even if you don’t have technical expertise, you can still repair it. Here are some of the best methods to repair this issue on your system:

1. Change the Server Settings to its Maximum Limit

Try changing your server settings. Here set the inbound connections limit at the maximum limit.
  • To do this, open the Microsoft Exchange Server Administrator utility. The access path of this utility will vary depending on the installation procedure used to set up Exchange Server.
  • Once you open the MS Exchange Server Administrator utility, click the ‘Connections’ icon in the left side navigation pane. Now double click the internet mail service icon in the right side pane. As you click it, the Properties window will open.
  • Now click the ‘Connections’ tab in the Properties window and then click the ‘Advanced’ button. This will open the configuration window.
  • Here reset the number for ‘Maximum Number of Inbound Connections’ to a high number, its maximum limit. After changing the settings, close all open Exchange Server Administrator program windows to successfully complete the process.
After the process is complete, try accessing your Outlook email account again; if it works, then that’s great the error 421 is resolved. However, if it doesn’t, then the problem could be related to viral infection.

2. Download a PST Repair Tool

If the cause of the error is PST files corruption, then not only will you be locked out of your email account, you are also at risk of losing all the data stored in your email account. However, the best way to resolve the error and ensure full data recovery is to download a reliable PST repair tool. By running a PST repair tool on your system, you can resolve the error 421 right away. It recovers your data, repairs corrupt and damaged PST files.

3. Scan Your PC with Restoro.

If viral infection and Trojans are causing the error 421 to pop up on your system, then it is recommended to download and scan your PC with Restoro. This is an advanced, intuitive, and user-friendly PC fixer. It is not just an antivirus but also a system optimizer and a registry cleaner. Unlike common antivirus software that only removes viruses and simultaneously slows down the system’s speed, Restoro removes all types of malicious software on your PC including malware, spyware, Trojans, and viruses, and also boosts the speed of your PC significantly. It is safe, easy to operate, and a quick fixer. It is compatible with all Windows versions. Click here to download Restoro and resolve error 421 today!
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Should you upgrade to Windows 11
Windows 11 has been rolling out for a while now so many PC users ask the question is it wise and good to upgrade your Operating System to the latest Microsoft incarnation. No Thank you for reading, cya tomorrow in next article. Windows 10 vs Windows 11Jokes aside, I truly believe that choosing to upgrade your System to Windows 11 at this point in time is a bad decision and I will explain why I do believe it.

Reasons to upgrade to the new OS

First of all, let me say what is good in Windows 11 and provide reasons why you should upgrade your computer.
  1. The new fancy look made for modern computers. New Windows new look, Microsoft has tried their best to bring a new modern look to its flagship operating system and I must say that they have managed it. I could argue that it is a little bit late since Apple had this kind of look in years but hey, better late than never I guess.
  2. Increased security This point is very valid but it will play a role only if you have all system requirements including TPM 2.0. If that is the case new security features of OS are really well done and are perhaps one thing that might nudge some people in installing W11 on their system.
  3. New settings app The New and redesigned settings app inside Windows 11 is really great and it provides a great workflow and easy management of system settings. This is not some radical change but it will save time and make life much easier.
  4. It is better suited to the newest hardware Windows 11 was made with the newest hardware in mind and its performances on it are great so if you are punching the latest tech this reason is sufficient to make a switch, however, if you are still on an older system you will not gain much by switching.

Reasons to avoid Windows 11 for now

  1. Almost just a visual update to Windows 10 Some features of Windows 11 are great but they are not plenty of them to justify a new number and new version of OS. Considering what we really got new under the hood Windows 11 could have been just a patch and update to Windows 10 since the architecture is the same.
  2. Bugs Each day there are new bugs reporting for Windows 11, most of them are at the moment unsolvable and are caused because hardware manufacturers' drivers and software overall is not W11 ready. This hinders the stability of some systems and introduces headaches to others.
  3. Runs poorly on unsupported hardware Strange behavior has been reported on some older systems, granted systems are not officially supported but the point is OS is simply not working at the top of its game on older hardware.
  4. No updates on non supported systems Officially stated if you install Windows 11 on non-supported hardware you will not get any security updated on in. This is a deal-breaker as far as I am concerned.
  5. It is still under development When Windows 11 was released, Android native apps were not working on it, it later came with an update, this is just one example but there are more features that were promised but are not delivered on release and constant updates are fixing these things. It is obvious that Windows 11 is still under active development and not the final product that was promised.
  6. Microsoft’s edge pushing And not just edge, some other things as well but most notably is edge pushing to borders they are risking lawsuit similar as they did in the past pushing and disabling any other browser except internet explorer.

Conclusion

Firstly I want to point that this is my personal opinion but going through facts and taking into account the current state of Windows 11, at this point, it is not worth making a switch. I am sure that in time it will become a system that will be worth upgrading to but until that time comes, my advice would be to stay with Windows 10.
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How to Fix PFN_LIST_CORRUPT Error on Windows
If you suddenly encounter PFN_LIST_CORRUPT Blue Screen of Death error while using your computer then it means that the Page Frame Number or PFN list is corrupted. Page Frame Number is an indexing number used by the hard drive to find out the location of every single file on the physical disk. This kind of Blue Screen error is usually caused by a driver that’s passing a bad memory descriptor list and it can either be temporary or permanent. And so to fix this particular BSOD error, read on as this post contains a couple of suggestions that could help. Keep in mind that when you get a Blue Screen error like PFN_LIST_CORRUPT, the power connection to your PC must not be interrupted and so if you are using a laptop, it’s best if you connect it to a power source. On the other hand, if creating a dump from 0% to 100% takes up more than 5-10 minutes, then you have to force shut down your computer by pressing and holding the Power Key for 10 seconds or at least until the CPU lights turn off. After you do that, proceed to the troubleshooting tips prepared below.

Option 1 – Run the Blue Screen Troubleshooter

The Blue Screen troubleshooter is a built-in tool in Windows 10 that helps users in fixing BSOD errors like PFN_LIST_CORRUPT. It can be found on the Settings Troubleshooters page. To use it, refer to these steps:
  • Tap the Win + I keys to open the Settings panel.
  • Then go to Update & Security > Troubleshoot.
  • From there, look for the option called “Blue Screen” on your right-hand side and then click the “Run the troubleshooter” button to run the Blue Screen Troubleshooter and then follow the next on-screen options. Note that you might have to boot your PC into Safe Mode.

Option 2 – Run a System File Checker scan

You can also try to run a System File Checker or SFC scan in order to scan your computer for corrupted files that might be the cause behind the PFN_LIST_CORRUPT error. Once it finds any corrupted system files, it will automatically fix them. To run System File Checker, here’s what you have to do:
  • Tap Win + R to launch Run.
  • Type in cmd in the field and tap Enter.
  • After opening Command Prompt, type in sfc /scannow
The command will start a system scan which will take a few whiles before it finishes. Once it’s done, you could get the following results:
  1. Windows Resource Protection did not find any integrity violations.
  2. Windows Resource Protection found corrupt files and successfully repaired them.
  3. Windows Resource Protection found corrupt files but was unable to fix some of them.
  • Restart your computer after the scan is completed.

Option 3 – Check for any hard disk errors

  • On your desktop, right-click on the “This PC” or computer icon and then select Manage to open the Disk Management. Here you get to check your drive’s health.
  • Next, click on Disk Management on the left side panel.
  • From there, check the state of your drives. If it shows that all your partitions are healthy then it means all is good and that the problem may have something to do with some physical issues with your hard drive.
You might also want to run the CHKDSK utility to help you fix any issues with your hard disk. If your hard drive has issues with integrity, the update will really fail as the system will think that it’s not healthy and that’s where the CHKDSK utility comes in. The CHKDSK utility repairs hard drive errors that might be causing the problem.
  • Open Command Prompt with admin privileges.
  • After opening Command Prompt, execute the following command and hit Enter:
chkdsk /f /r
  • Wait for the process to be completed and then restart your computer.

Option 4 – Update the Device drivers

Updating the Device drivers can also help you fix the PFN_LIST_CORRUPT Blue Screen error. To do so, follow the steps below.
  • Tap the Win + R keys to launch Run.
  • Type in devmgmt.msc into the box and tap Enter or click OK to open the Device Manager.
  • After that, a list of device drivers will be displayed. If you see a red or yellow sign that shows up against the driver, right-click on the driver and select “Update Driver Software”.
  • Select the “Search automatically for updated driver software” option and then follow the instructions to complete the process.
  • Restart your PC and then check if the Blue Screen error is now fixed or not.

Option 5 – Disable OneDrive

The PFN_LIST_CORRUPT error might also be caused by OneDrive. Thus, you have to try disabling this program to resolve the problem.
  • Tap the Ctrl + Shift + Esc keys to open the Task Manager.
  • Once the Task Manager is open, click on More Details located at the bottom left portion of the window.
  • Then go to the Startup tab and select Microsoft OneDrive and then click Disable.
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Edge and Store apps are not connecting
If your Microsoft Edge browser and Windows Store apps are now unable to connect to the internet after you have just installed the newly released Windows 10 v1809 October 2018 update, then this post might help. As you know, Microsoft has made a change recently and because of this, some users are getting the “Hmm, we can’t reach this page” error when they try to open Microsoft Edge as well as other pre-installed apps like News, Mail, and so on. Aside from that, you also won’t be able to connect the Microsoft Store apps to the internet. What’s strange is that you can connect to the internet using other programs like Google Chrome, Internet Explorer, and many more. Apart from checking your internet connection, there are other things you can to resolve the problem. If your Windows Store apps are not able to connect to the internet and you’re only getting the Error 80072EFD, then you might have to enable IPv6 as the new Windows 10 v1809 requires IPv6 to be enabled so that you can use the UWP apps. And so you have to enable IPv6 in the network card along with IPv4. To do so, follow the steps below. Step 1: Tap the Win + R keys to open the Run dialog box. Step 2: After that, type “ncpa.cpl” and hit Enter or click OK to open Network Connections. From there, you will see your currently connected network profile. Step 3: Right-click on your network profile and select Properties and then go to the Networking tab and look for the “Internet Protocol Version 6 (TCP/IPv6)” and select its corresponding checkbox. Step 4: Now click the OK button to save the changes made and restart your computer.
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Screensaver Timeout Settings
One of the cool and interesting features in Windows is the Screensaver which allows users to display animation or change the wallpaper automatically when the computer is not being used. This feature can also time out and lock your computer when it remains idle for quite some time. However, if you notice that the screensaver of your computer turns on a lot earlier, then you’ve come to the right place as this post will guide you on how you can change the timeout settings of the screensaver of your Windows 10 computer. Usually, the screensaver in Windows 10 is turned off by default, however, if some other user has turned it on or if you have turned it on, you can actually change the timeout settings of the screensaver using several methods. You can do it through the Personalization settings, Registry Editor, as well as the Group Policy Editor. Before you proceed with the instructions provided below, make sure that you create a System Restore point first. Once done, follow each one of the suggestions carefully to successfully change the Screensaver timeout settings in Windows 10.

Option 1 – Modify the timeout settings of Screensaver via Personalization settings

  • Open the Start menu and type “screen saver” in the field.
  • On the search results that appear, click on the “Change Screen Saver” option.
  • From there, you have the option to change the screen saver type, preview, open settings, change the wait time, as well as choose to display lock screen on your resume.
  • Now to change the timeout settings of your screensaver, you have to increase the wait time from 1 to 15 or anything that works for you.
  • Once done, click OK and exit to save the changes made.

Option 2 – Try to change the screensaver time via Registry Editor

The next option you can try to change the timeout settings in the screensaver is using the Registry Editor. To get started, follow these steps:
  • Tap the Win + R keys to launch the Run utility and type “regedit” in the field and hit Enter to open the Registry Editor.
  • Next, navigate to this registry path: ComputerHKEY_CURRENT_USERSoftwarePoliciesMicrosoftWindows
  • From there, right-click on Windows located in the right pane and select New > Key.
  • Name the key as “Control Panel” and right-click on it and select New > Key and then name it as “Desktop”.
  • Once done, click on the newly created Desktop key to highlight it.
  • After that, right-click on any empty space in the right pane and select New > String Value and then type “ScreenSaveTimeOut” and hit Enter to save it.
  • Now right-click on ScreenSaveTimeOut and select Modify and then set its value data in seconds.
  • Click on OK and exit the Registry Editor to save the changes made.

Option 3 – Change Screensaver timeout settings via Group Policy Editor

  • Tap the Win + R keys to open the Run dialog box and type “gpedit.msc” in the field and hit Enter to open the Group Policy Editor.
  • Next, navigate to User Configuration > Administrative Templates > Control Panel > Personalization.
  • Then look for a policy setting named “Screen saver timeout” and double click on it and then click on the Enabled option to enable it.
  • Add the screen timeout in seconds and click on the Apply and OK buttons to save the changes.
  • Restart your computer.
Note: If you want to disable the screensaver feature in your computer, you can always do so by disabling a policy setting named “Enable Screen Saver”.
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Can’t download anything on your Windows PC
Recently, a number of users reported that they weren’t able to download anything from the internet after they’ve updated their Windows 10 computers. This kind of problem occurs because of some Internet options settings located in the Control Panel. Based on the reports, this issue has been known to occur in all kinds of browsers and not only on Microsoft Edge. Not being able to download anything from the internet is a huge problem since almost everything is wrapped around the internet. To resolve this problem, here are some suggestions that you can try.

Option 1 – Temporarily disable Firewall and third-party antivirus

Firewall and antivirus programs are known to block files the instant it detects a threat to the system. However, there are some cases when it can also block a file even when it’s a safe one. Thus, your antivirus or firewall programs might be the reason why you can’t download anything on your Windows 10 computer. To isolate the issue, you need to temporarily disable both the Firewall and antivirus programs and then check if you can now download anything from the internet. Do not forget to enable them again as disabling them can leave your computer vulnerable to cyber threats.

Option 2 – Try changing the Internet Options settings

According to users, changing the Internet Options settings helped them resolve the problem. There are times when the drive location in your Internet Options settings is not the system drive, chances are, it will cause the error to pop up which is why you need to make sure that it’s correct.
  • Go to Control Panel and search for Internet Options and open it.
  • Next, go to the General tab and click on Settings.
  • From there, check if the drive location is “C:”. If it is, close the window, otherwise, click on the “Move folder…” option, and then select your preferred folder under drive C: and click OK.
  • Now restart your computer and check if changing the Internet Options settings helped in fixing the problem.

Option 3 – Try clearing browser data

There are instances when browser data can cause issues in downloading files online. And so you can try to clear your browser’s data. This might be a very basic solution but oftentimes it works in fixing this kind of error. Follow the steps below to clear the data in your browser.
  • Open your Google Chrome browser.
  • After that, tap the Ctrl + H keys. Doing so will open a new panel that allows you to delete the browsing history and other data in your browser.
  • Now select every checkbox that you see and click on the Clear browsing data button.
  • Then restart your Chrome browser and check if you can now open any website or not.

Option 4 – Get rid of any conflicting browser extensions

  • Open Chrome and press Alt + F keys.
  • Go to More tools and click Extensions to look for any suspicious browser extensions or toolbars.
  • Click the Recycle bin and select Remove.
  • Restart Chrome and press Alt + F keys again.
  • Proceed to On Startup and mark Open a specific page or set of pages.
  • To check if the browser hijacker is still active, click Set pages, if it is active, overwrite the URL.

Option 5 – Try to remove Proxy

Removing the Proxy might also help you in fixing the connection issue in Cortana. Here’s how you can do it:
  • Tap the Win + R keys to open the Run dialog box.
  • Then type “inetcpl.cpl” in the field and hit Enter to pull up the Internet Properties.
  • After that, go to the Connections tab and select the LAN settings.
  • From there. Uncheck the “Use a Proxy Server” option for your LAN and then make sure that the “Automatically detect settings” option is checked.
  • Now click the OK and the Apply buttons.
  • Restart your PC.
Note: If you are using a third-party proxy service, you have to disable it.

Option 6 – Try reinstalling your browser

If none of the options given above worked in fixing the problem, you can try to reinstall your browser. There are times when the browser wasn’t installed properly which can cause several issues like not being able to download anything from the web. Thus, reinstall your browser and see if that helps.
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