Fix Boot Device Not Found 3F0 Error

Razer is a well-known brand among PC gamers and users, it started as a peripheral manufacturer focused on keyboards and mouse but after years passed Razer expanded its inventory offerings. It soon started offering headphones and lately has branched into wider product lines like gaming chairs and protection masks. It is not a big surprise that Razer is expanding into other branches of the PC industry. This time, however, it has revealed not one but three new hardware for your PC. Case fans, all in one liquid cooler and power supply. There are not many details about the products themselves but one thing is one hundred percent confirmed, they come with Razer Chroma, all of them, even the fans.

Katana Chroma ATX PSU

Most interesting for me personally is Razers Katana, the power supply unit. It is a modular power supply ranging from 750W to 1200W with the additional option of Titanium rated one with an impressive 1600W of power. Power supply will start shipping in early 2022 and at the time of writing this article no price range has been released.

Razer Hanbo AIO

Hanbo liquid cooler will feature an optimized intake design so it can ensure greater heat transfer and fluid dynamic for improved reliability and silent operation. Radiator comes in 240mm size with two fans and a larger one of 360mm with three fans. The pump will be able to rotate in any direction of full 360 degrees so it can fit in any case. Hanbo will be released in November this year but no pricing has been released so far.

Razer Kunai Chroma case fans

Kunai fans will boast high static pressure performance with lowered noise. They will go as far as 2200rpm for the 120mm version where the 140mm version will go up to 1600rpm. They will come with addressable LEDs and up to eight fans will be able to be connected to Razer’s PWM fan controller that will come with a magnet at the back for easy attachment to any steel part of PC casing. PWM will use Razer’s Synapse software to customize pulse width modulation in order to improve airflow and noise. PWM will be priced at $49.99 in the Razer Store and it is available for preorder. Fans are priced at $44.99 for one 120mm or $129.99 for a three-pack of 120mm. One 140mm will go for $49.99 and a three-pack will be $129.99.

If you’ve tried resetting your Windows 10 computer using the Reset This PC option in order to restore your computer’s factory settings and the process suddenly fails for some reason and you got an error message instead stating, “There was a problem resetting your PC, No changes were made on your Windows 10 computer”, then this post might help you resolve the problem. Carefully follow each one of the options given below to resolve the “There was a problem resetting your PC error on Windows 10.

Option 1 – Try renaming the System and Software hive

• If you’re still able to boot to the desktop of your Windows 10 PC, open an elevated Command Prompt from the WinX menu.
• Now use the CD command and change the directory to Windows\System32\config folder. Simply type in the following command and hit Enter:

cd %windir%system32config

• After that, you have to rename the System and Software registry hives to “System.001” and “Software.001”, respectively. To do that, just type each one of the following commands and hit Enter after you type each of them.
  • ren system system.001
  • ren software software.001

On the other hand, if your Windows 10 PC isn’t able to boot to the desktop, you can just access Command Prompt from the Advanced Startup options or you can also boot into Sage Mode and open Command Prompt from there and then run the given commands above. Note: If you only want to use the Refresh your PC option, you must only rename System hive and not Software hive. On the other hand, if the Software hive is really corrupted, you might not be able to use the Refresh your PC option in such a case. Thus, you really need to rename the Software hive as well. Once you’ve renamed the Software hive, you won’t be able to use the Refresh your PC option but only the Reset your PC option.

• Type “exit” to close the Command Prompt and then restart your PC and try resetting your PC again.

Option 2 – Try to disable and re-enable the Windows Recovery Environment

If the first option didn’t help, you can try disabling the Windows Recovery Environment and then enable it back again. To configure a Windows Recovery Environment or Windows RE boot image and recovery options, you have to use the REAgentC.exe tool.

• Tap the Win + S key and type “REAgentC.exe” to open the REAgentC.exe tool.
• After that, type the following command and hit Enter to disable the Windows RE:

reagentc /disable

• After disabling the Windows RE, you need to enable it back by typing the following command:

reagentc /enable

Option 3 – Try to boot the USB recovery drive

If the two previous options failed, you need to try another workaround which is to boot to the USB recovery drive > Troubleshoot > Recover from a drive. From there, follow the on-screen instructions and you should be good to go.

Why combining hard drives with storage spaces? Ok, I will admit it, I am a modern digital hamster when it comes to digital goods. I like to collect stuff and more than anything else I like to have all of that at the tip of my fingers. And how digital goods grow in size themselves (movies on Blu-ray are like 50GB each) and the collection grows in size single hard drive is starting to be completely obsolete when it comes to storage. Sometimes we will need large storage for these kinds of personal collections, sometimes we will need it for work reasons. Whatever your reason might be Windows 10 is offering us a solution via Storage spaces. Storage spaces is an integral part of Windows and it is meant as a tool to provide you with a RAID environment without a RAID controller. Of course, combining multiple hard drives via storage paces instead of RAID will not be so fast or stable but for home use of storing a large quantity of data is perfectly enough. With Storage Spaces you will also have an option to reduce some space for increased security of data loss if by any chance one of your HDD fails.

How to Create a Storage Space

To create storage space in Windows, press ⊞ WINDOWS + R to open the run dialog. In the run box type in Control Panel and press ENTER In Control Panel find Storage Spaces and left-click on it. Once storage spaces open, left-click on Create a new pool and storage space Once you click on create new, you will be greeted with a list of hard drives you can use for this operation. Please note that all hard drives you choose will be completely erased and formatted and then assign a single drive letter. Click on Create pool. You will find yourself in new storage options where you can assign a drive letter, give storage space a name, etc.

Storage spaces types

One thing I would like to focus on here is resiliency type, when you expand the resiliency type drop-down menu you will see 4 options inside. Simple, Two-way mirror, Three-way mirrors, and Parity. Simple: If you choose Simple as an option, you will have maximum hard drive space but no resiliency at all, meaning that if by any chance any of your hard drives malfunction, you are losing your data from that drive completely. Two-way mirror: This option will save your data if one of your drives fails but you need at least 2 drives and storage space will be limited since some of it will be a safe backup option for the case of a drive failure. However if one of your drives fails, you can replace it in a second and keep on working as nothing happened. Three-way mirror: This option similar to the previous one will offer you safe data-keeping from a hard drive failure. this option will save your data even if 2 hard drives malfunction but it will require having 5 of them connected in order to be able to choose this option. Parity: Maybe the most popular option among people who want to have 2 or 3 drives merged but do not want to lose too much space of the two-way mirror option. It offers some protection and it does not take so much space as two-way does, let us say it is a kind of win-win situation.

Conclusion

I personally go for simple and have an important backup on optical drives but only for reason I could use more space, know that this way is requiring from me to always have a backup in optical media and that I will need to restore all of it back if even one HDD fails which could take time. But if this way is ok with you, go for it, you will have more space to use.

IRQL_NOT_LESS_OR_EQUAL - What is it?

IRQL_NOT_LESS_OR_EQUAL error is a type of blue screen of death (BSoD) error. It is a typical Windows PC error that occurs even in the latest Windows versions. The IRQL_NOT_LESS_OR_EQUAL error occurs on the computer screen when a memory address triggers unauthorized access. This leads to the suspension of your login session. The computer screen turns blue.

Solution

Error Causes

IRQL_NOT_LESS_OR_EQUAL error occurs due to several reasons. However, the most common causes for this error code include:

• Incompatible device drivers
• The poor device driver installation
• Faulty hardware
• Disk fragmentation
• Registry issues
• Viruses and malware attack

Blue screen of death error codes like IRQL_NOT_LESS_OR_EQUAL is critical. If not resolved timely, this error code can pose serious threats to your PC. It can lead to system crash and failure, due to which you can also lose your valuable data stored in your system. How to Fix IRQL_NOT_LESS_OR_EQUAL Error Code?

Further Information and Manual Repair

Here are some of the best and easy DIY methods to resolve this error code on your PC:

1. Roll Back Drivers

If the underlying cause of IRQL_NOT_LESS_OR_EQUAL error is poor driver installation, then try this method to resolve the issue. This can be done by simply clicking the start menu. Once you click on it, go to the control panel, then double click the system icon and locate the System Properties window. After that, click the hardware tab and then the device manager button. Now locate the device you recently installed. Double click on the recently installed device driver, click the driver tab, and then the rollback driver button. This will take a while, so wait for the process to finish.  After that, reboot the system.

2. Run Hardware Diagnostic

The IRQL error may also be triggered by faulty hardware. To identify which hardware is causing the error to pop up, you will have to run a hardware diagnostic.

• For this, go to the start menu, type Memory Diagnostic in the search bar.
• Now access this tool and click on Diagnose your memory problems. As you click it, it will ask you to perform the check by either restarting the PC immediately or on the next restart.
• Select the immediate one to get going. The system will carry a scan on the memory and show you the list of problematic errors detected during the scan. To resolve this error then all you have to do is replace the piece of faulty hardware.

Nonetheless, if no faulty hardware is detected, this means the error is related to memory. If so, try method 3 to resolve.

3. Disable Memory Caching

To fix the IRQL_NOT_LESS_OR_EQUAL error, try disabling the memory caching option. This is called BIOS memory caching. This can be done by restarting your PC and pressing the BIOS setup keys to enter the settings screen. Mostly it is an F2 key, however, it may be different in some computers as the motherboards of different makes have their own respective keys. Once you enter the BIOS settings look for options stating memory settings. Access these options and disable the memory caching feature.

4. Scan your PC for Malware

As mentioned above this error message can also result due to the intrusion of malicious software like malware, viruses, and spyware. To detect and remove them from your PC, download an antivirus and perform a system scan. Remove the detected viruses and malware to resolve. Please note, antivirus installation may lower the speed of your PC.

5.  Repair Registry and Fragmented Disk

Due to poor PC maintenance, you may experience registry issues. The registry stores all the activities performed on the PC including the unnecessary pieces of information like junk files, internet history, temporary files, cookies, and other flies. Such files take up a lot of disk space. When there is not much space on the storage device, the new data is saved in fragments. This is called disk fragmentation. When this file becomes fragmented it takes time to rearrange the data and reunite it to run the fragmented file on your PC. If not resolved, this leads to registry issues and thereby generating various PC error codes including IRQL_NOT_LESS_OR_EQUAL errors. The best way to clean the registry and repair the fragmented disk is to download Restoro. This is an advanced and multi-functional PC Fixer. It is embedded with multiple system repair utilities including a powerful registry cleaner that detects all registry issues in seconds, removes and wipes out unnecessary files cluttering the registry, cleans and repairs the registry and the damaged files. Other utilities include an antivirus that detects privacy errors and all types of malicious software infecting your system. It also functions as a system optimizer which means by running this software on your PC you won’t be compromising on your system’s performance. The system optimizer utility boosts the speed of your PC. This tool is safe and efficient. It has a user-friendly interface and is compatible with all Windows versions. Click here to download Restoro and resolve the IRQL_NOT_LESS_OR_EQUAL error code right away.

Hello and welcome everyone, just a few years ago we had FLASH video content on the internet, we had FLASH games, full FLASH website experiences, and more, but then flash was shut down mostly due to security reasons meaning that in just a few months we have lost most of FLASH web content. However, there is still FLASH content on the internet even today, there are still FLASH videos and flash games, but we can not play any of that content since browsers do not support FLASH and you can not get the FLASH plugin for browsers. So what might be the solution for this situation?

Ruffle and FLASH emulation

Emulation of course. We will not be able to get the flash player working, well at least not the original and official one, but we can make flash content playable again inside our browsers. The first thing is first, we need to get an emulator package from the internet in order for this trick to work, one we will be using is RUFFLE. It is lightweight, it is free, it is open source and it is reliable, everything we need. Download RUFFLE from its official website here. For Chrome and Edge download the ZIP package, for Firefox, go to the Firefox section of the tutorial. There is also a desktop version of RUFFLE there so if you are keen on playing your flash content on your desktop computer you might well grab that as well, but for the sake of this tutorial where we are enabling flash in our browsers, we will not focus on that part since it is pretty straightforward. Now once you have downloaded the RUFFLE emulator, please extract it to the desired folder somewhere on your computer. Once it is extracted, start your browser of choice and follow instructions.

FOR CHROME:

1. Navigate to: chrome://extensions/
2. Turn ON developer mode in the top right corner
3. Click on Load unpacked
4. Navigate to the folder where you have extracted RUFFLE

FOR EDGE:

1. Navigate to: edge://extensions/
2. Turn ON developer mode on the bottom left corner
3. Navigate to the folder where you have extracted RUFFLE
4. Turn RUFFLE ON

FOR FIREFOX:

1. Go to the RUFFLE download page, we can not use the zip package we were using for Chrome and Edge
2. Right-click on the Firefox download link
3. Save link by clicking on Save link as...
4. Navigate to about: debugging
5. Click on this Firefox
6. Click Load Temporary Add-on
7. Select the .xpi that you have downloaded

BONUS:

If you want to enable FLASH content live on your website use:  <script src="path_to_ruffle/ruffle.js"></script>

Recently, a number of users reported an error when they tried to open graphic-intensive apps like video games. According to users, when they tried to open an app, they get the “Display driver failed to start” error instead. Thus, if you encounter the same error, then you’ve come to the right place as this post will guide you on how exactly you can fix it. Here’s the full content of the error message:

“Display driver failed to start; using Microsoft Basic Display Driver instead. Check Windows Update for a newer display driver.”

This kind of error could be due to several factors. It is possible that it could be a result of a corrupted or outdated graphics driver. Aside from that, it could also be due to some issues with the system settings. Worry not though for there are potential fixes that can help you fix the problem. But before you troubleshoot the problem, you need to update your Windows 10 computer first and if it didn’t help fix the problem, then here are the potential fixes that should help resolve the “Display driver failed to start” error.

Option 1 – Try to restart the Graphics driver

Although Windows 10 can recover the graphics driver on its own when it crashes, there are times when it fails to do its job. To restart the graphics driver in your computer, simply tap the Win + Ctrl + Shift + B key combination. After that, the graphics driver will be back in less than a second.

Option 2 – Try running the Hardware and Devices troubleshooter

Running the built-in hardware and devices troubleshooter can also help you in fixing the “Display driver failed to start” error.

• 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 Keyboard 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 update or rollback the Graphics driver

You can try to update your Graphics card driver using the Device Manager in your computer to resolve the “Display driver failed to start” error or you can also go directly to the website of your graphics card manufacturers like NVIDIA, Intel, or AMD and go to the section called Drivers then check if there’s a new available update – if there is, download and install it. To update your Graphics driver via Device Manager, refer to these steps:

• First, boot your computer into Safe Mode.
• After that, 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. From there, look for the Display Adapters and click on them.
• After that, right-click on each entry under the Display Adapters and select the “Uninstall Device” option from the menu.
• Now restart your computer.
• After restarting your computer, go to the Settings app and Check for Updates in the Windows Update section.

Option 4 – Try setting your system for maximum performance

If the first three options didn’t fix the error, you can try setting your computer for maximum performance since Windows 10 allows you to choose the effects you want to activate your system and you can do this by adjusting the performance ratio. Adjusting the performance ratio can be done via a certain setting in your computer – and this setting should be set to “Maximum Performance” to resolve the error.

• In the Windows Search bar, type in “performance” and from the search results that appear, select the “Adjust the appearance and performance of Windows” option.
• Next, a mini window will appear and from there, click on the radio button that says, “Adjust for best performance”.
• Once done, click on the Apply and OK buttons to save the changes made. This should resolve the problem.

A number of users reported that they encountered an error that says, “Windows doesn’t have a network profile for this device” while they tried to connect Network devices such as printers and speakers to their Windows 10 computers. On the other hand, this kind of issue is reported for non-network devices as well. This kind of error might be due to incompatibility between the device and your operating system or it could be that the network drivers in your computer need to be updated in order to recognize the new device. Whatever the cause is here are a couple of suggestions you can try to resolve the “Windows doesn’t have a network profile for this device” error.

Option 1 – Check if the network device is compatible with your operating system

As mentioned, the error could be due to incompatibility between the device and the system. To verify, just go to the website of the device’s manufacturer since you can find all the information about the device there.

Option 2 – Make sure that your computer is discoverable

• Click on the Start button.
• Then click on the gear-like icon to open Settings.
• After that, select Network & Internet >> Wi-Fi.
• Next, change the Network Profile to Private.
• Now restart your computer and then connect the device again and see if the error is gone or not.

Option 3 – Try to update or rollback or uninstall the Network drivers

You might also want to update or roll back or disable your Network drivers to fix the “This operation failed as no adapter is in the state permissible for this operation” error.

• Tap the Win + R keys to launch the Run window and then type in the “devmgmt.msc” command and hit Enter to open the Device Manager window.
• Under the Device Manager, you will see a list of drivers. From there, look for the Network Adapters and expand it.
• Then right-click on each one of the Network drivers and depending on your preference, you can either select “Update driver”, “Disable device” or “Uninstall device”.
• After that, restart your PC and see if it helped in fixing the “Windows doesn’t have a network profile for this device” error.

Option 4 – Try to check the SNMP status

• Tap the Win + R keys to open the Run dialog box and type “services.msc” in the field and tap Enter to open the Service Manager window.
• After opening the Service Manager, look for the SNMP Service from the list of services.
• Once you’ve found the SNMP Service, make sure that its Service Status is set to “Running”. If the service is not running, just right-click on it and select Properties.
• From there, change the Service Status to Automatic and then click on the Apply and OK buttons.
• After that, click on the Start button again and check if the error is now fixed.

Note: If your printer is the one that triggers the error, refer to these steps:

• You have to go to Control Panel > Devices & Printers.
• From there, right-click on the printer which is the one that causes the error, and then select Printer Properties.
• Next, click the Configure Port button under the Ports tab and select SNMP Status Enabled.
• Now click the OK button and check if it fixes the error or not.

Option 5 – Run the Hardware and Devices Troubleshooters

You could also run this troubleshooter to fix the “Windows doesn’t have a network profile for this device” error.

• 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 advanced guide given below.

Internet connectivity issues like Can’t connect to this network present a complex problem with simple solutions for PC and laptop users. First, it is usually recommended that users rule out problems with the internet connection, router, and Wi-Fi settings before proceeding to troubleshoot settings on your PC/laptop. Once the rest are ruled out, we can then proceed with the following troubleshooting steps and guidelines to fix your wifi connection issue: The first step is to update your windows network adapter driver. Connectivity problems may arise if your network driver is not updated or if it is incompatible with the network adapter. To do so, you may resort to any third-party driver scanning and installing programs found online. This solution should resort if users don’t want the hassle of perusing through windows settings that users may not be familiar with. However, this solution requires a pre-existing internet connection other than wifi, so it is recommended you have a backup internet connection via ethernet. The second step is to uninstall the driver for your network adapter. This solution is to resort if there is an issue with the driver as restarting the PC after the following steps let windows reinstall the driver again:

• Open the quick access menu on your keyboard by pressing the Windows key and X key at the same time and select “Device Manager” from the menu list.
• From the list of devices, select “Network Adapters”
• Usually on the top of the list is the Wireless Network Adapter
• Right-click the Wireless Network Adapter and select the option to “Uninstall device”
• You will be given a confirmation in a new separate window to proceed. Click “Uninstall” to proceed.
• After completing the previous steps, try rebooting your Windows PC and reconnecting to see if it works.

A third step is to disable the 802.1 1n modes of your network adapter by following the next steps:

• First press the Windows logo key and the X key at the same time to bring up the quick-access menu. And like the previous step, select “Device Manager”
• From the list of devices, select “Network Adapters”
• Right-click the Wireless Network Adapter from the drop-down menu and select properties
• Under properties, select the “Advanced” tab then select the 802.1 1n Mode. To the right drop-down menu change the option to  “Disabled” and click “Ok”
• After, try to re-establish the connection to see if the steps have worked.

In the event that any of the preceding did not fix your problem, it helps to take a second look at the router and network settings using the interface provided by your ISP. A simple reset to the back of your router often fixes the issue. Also, try to check if you have any other administrative capabilities over the network to determine whether your device, in particular, has been MAC filtered or if the frequency of your wireless adapter is not compatible with the broadcast frequency of your router.

The Blue Screen of Death error or BSOD is definitely not an issue to face on your computer. Many users, if not all, have already experienced this headache at least once. One of these BSOD errors is the ATTEMPTED EXECUTE OF NOEXECUTE MEMORY error. The bug check error code for this is 0x000000FC and is usually caused by outdated or faulty drivers. In some cases, it could also be caused by an error in the Random Access Memory or RAM. This kind of error in the RAM might be physical, based on drivers, or even some kind of unwanted malware. So basically there are lots of possibilities why this particular BSOD error pops up. If you are currently facing this BSOD error, read on and carefully follow the suggestions given below but before you do that, make sure to create a System Restore point just in case something goes wrong. This way, you can always undo those changes using the System Restore point. Once you have that covered, proceed to the options given below to fix the ATTEMPTED EXECUTE OF NOEXECUTE MEMORY error.

Option 1 – Try updating Windows 10 with all the security patches and updates

You might be able to fix the ATTEMPTED EXECUTE OF NOEXECUTE MEMORY error by simply updating your Windows 10 computer with all the security patches and updates. To do so, go to Settings then proceed to the Windows Update section > Update & Security > Windows Update, and then click on the Check for Updates option. After you do that, it will automatically find and install all the latest security patches and feature updates from Microsoft.

Option 2 – Try updating all your drivers

From time to time, drivers get corrupted or outdated so it’s no surprise that they conflict with the operating system and cause errors like the ATTEMPTED EXECUTE OF NOEXECUTE MEMORY BSOD error. To fix the problem, you need to update all your drivers. Follow the steps below to update your drivers.

• 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’s name and select “Update Driver Software” or “Uninstall”. And if you find any “Unknown device”, you need to update it as well.
• Select the “Search automatically for updated driver software” option and then follow the instructions to complete the process.
• Restart your PC.

Note: You also have the option to go directly to the website of your graphics card manufacturer and check if there’s a new update – if there is, download it.

Option 3 – Try running a Memory Check using Windows Memory Diagnostic

As mentioned, this error might be caused by some issues in the memory. To resolve it, you need to run the Memory Check on your Windows 10 PC. Refer to these steps to do so.

• Tap the Win + R keys to open the Run dialog box.
• Then type “mdsched.exe” in the field and hit Enter to open the Windows Memory Diagnostic.
• After that, the Windows Memory Diagnostic will give out two options such as:

1. Restart now and check for problems (recommended)
2. Check for problems the next time I start my computer

• Select any of the given options. After that, your computer will restart and check for memory-based issues upon the restart. If there are any issues, it will automatically them.

Option 4 – Try using the System File Checker via Command Prompt

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 causing the ATTEMPTED EXECUTE OF NOEXECUTE MEMORY BSOD error. 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.

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.