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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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Microsoft Store Error 0x80072F7D in Windows
Check your connection. Microsoft Store needs to be online. It looks like you’re not. Check connection Code: 0x80072F7D
This is the error that you get if trying to open the Microsoft store on Windows 10 and it fails. If you experienced this error and are unable to access the store do not despair we are here to help you. This particular error is usually due to some internet issues, follow the presented guide step by step in order to solve it and be able to access the Windows store again.
  1. Check your Internet connection

    Since this error is closely tied to internet connection it is advisable to first eliminate the obvious and check if your computer is connected to the internet.
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    Built-in Windows troubleshooter is a great tool and we will be using it in the next few segments in order to locate the issue and fix it. Open Windows 10 Settings app using the WINDOWS + I Click on Network & Internet Click on Network troubleshooter Select network adapter to diagnose Press the Next button.
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  4. Run Windows Store Apps troubleshooter

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If you encounter an error code of 0xa0000400 while trying to upgrade your Windows 10 computer using the Windows 10 Upgrade Assistant or the Windows 10 Media Creation Tool, then you might find this post useful as it will guide you in resolving this problem. When you get this error, you will see the following error message:
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As you know, keeping your computer up to date with all the Windows Updates is important and is imperative especially if you are experiencing a couple of issues like the Windows Upgrade error 0xa0000400. At the time of writing, there is no specific cause that has been found for this error. However, there are some potential fixes that might help you. You can try to recreate the Windows 10 installation USB and get the ISO files or you could also get a newer version of the Windows Media Creation Tool, or turn off your internet connection at a specific time or run the Windows Update troubleshooter. For more details, refer to the options given below.

Option 1 – Try to recreate the Windows 10 installation USB

Recreating the Windows 10 installation USB might help in fixing the problem. You can use a USB drive to do so but make sure that it has a great read-write speed. Follow the steps below to recreate Windows 10 installation USB”
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Option 2 – Try turning off the Internet connection at a specific time

You might want to turn off your internet connection at a specific time. This option can be quite tricky so what you need to do is to disconnect the internet connection when the update is downloaded using the Windows Upgrade tool. It’s actually okay since all the files you need would be downloaded safely and the Windows Upgrade tool will be the one to install the newer updates using those files.

Option 3 – Try to get a newer version of the Windows Media Creation tool

You can also fix the Windows Upgrade error 0xa0000400 by using the latest version of the Windows Media Creation tool. And so if what you have is an older version, you need to update it in order to resolve the error and upgrade your Windows 10 computer.

Option 4 – Run the Windows Update Troubleshooter

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Option 5 – Try running Disk Cleanup

You might want to run the Disk Cleanup utility as it is a useful tool that could delete temporary and useless files in your computer.
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Option 1 – Try updating Windows 10 with all the security patches and updates

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Option 2 – Try updating all your drivers

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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

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

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Error Code 0x8007001 - What is it?

Error Code 0x8007001 occurs during installations that take place in Windows 10.  Various versions of this same error have also been present in previous editions of the software and the methods to resolve the error across these versions are the same

Common symptoms include:

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Solution

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Further Information and Manual Repair

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Method One:  Load the Install Files on an Alternative Disk

In some cases, the operating system simply cannot recognize the installation files that are present on the disk in question, whether it is on a hard drive, a set of downloaded files, or files from a flash drive. If this is the case on your particular machine, the simplest way to work around the problem is to load the installation files onto an alternative disk source, whether it be a flash drive, CD, DVD, or secondary hard drive. After these files have been properly loaded onto that alternative disk, attempt to run the installation from the alternative source instead.

If this method is successful, it means that the system may have had trouble recognizing the files involved in the installation from the first source, but that the files themselves were not corrupted or changed.

Make sure that you save the alternative disk source after your installation is complete in case you ever need to do a fresh installation on your machine.

Method Two:  Clean Your Disc and Your Drive

If you are installing files from a DVD or CD, check to make sure that the back of the disc is free from scratches and dust. If there are no visible marks on the disc, you may need to open up your disk drive to see if there is a build-up of dust or debris inside of the drive. If this is the case, simply clean your drive and re-attempt your installation process from the included disk.

Method Three:  Run the Windows Update Troubleshooter and Update Your Programs

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Method Four: Use An Automated Tool

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Option 1 – Try to update or reinstall the PC device driver

The Ndis.sys Blue screen error can occur when the device driver in your computer is outdated or corrupted. Thus, you either have to update or reinstall it to fix the issue.
  • 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.
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Option 2 – Rollback your Network drivers

If you have updated the driver software as of late and you suddenly got this BSOD error, you might have to roll back the device driver – in other words, switch back to the previous working version. To do that, follow these steps:
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Option 3 – Try running the System File Checker

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  • Tap Win + R to launch Run.
  • Type in cmd in the field and tap Enter.
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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 running the CHKDSK utility

Running the CHKDSK utility might also help you resolve the Netwtw04.sys failed BSOD error. 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 5 – Run the DISM Tool

The DISM tool is another command-line tool in the Windows operating system that could help users fix various corrupted system files. To use it, follow these steps:
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  • Then type in this command: DISM /Online /Cleanup-Image /RestoreHealth
  • The DISM command you entered will repair the corrupted system image. Do not close the window if the process takes a while as it will probably take a few minutes to finish.
  • Restart your PC.

Option 6 – Perform a System Restore

Performing a System Restore on your computer can also help you fix the ndis.sys Blue Screen of Death error. You can do this option either by booting into Safe Mode or in System Restore. If you are already in the Advanced Startup Options, just directly select System Restore and proceed with the next steps. And if you have just booted your PC into Safe Mode, refer to the steps below.
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Android Bluetooth threat

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Error 1321 is a Windows PC error. This occurs when you try to install a Microsoft Office suite or program on your PC. The set-up program stops responding and the error message is displayed on the computer screen in the following format:
‘Error 1321. Setup cannot modify the file file_name. Verify that the file exists in your system and that you have sufficient permissions to update it.’
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Solution

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Common causes of the occurrence of error 1321 are:
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Further Information and Manual Repair

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Method 1: Disable Encrypt Contents to Secure Data

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From the Author: ChatZum is a Browser add-on (toolbar) that enables its users to hover over images in Major Social network's websites and view a larger version of an image.

While installing this toolbar will track user web browsing sessions and will record website visits, clicks, and sometimes even personal information. This information is later used to display targeted ads to the user. To allow easier user tracking, the program changes the browser home page and default search engine to Nation Search Advanced, which injects additional advertisements and tracks user activity.

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About Potentially Unwanted Applications

If you have ever installed a free application or shareware, chances are high that the computer will get installed with a bunch of unwanted applications. A Potentially Unwanted Program, also called PUP, in short, is actually software that contains adware, installs toolbars, or has got other hidden objectives. These types of programs are generally bundled up with a free application that you download from the internet or may also be bundled inside the custom installers of many download websites. PUPs aren’t always viewed as “pure” malware in the strictest sense. A fundamental difference between PUP and malware is distribution. Malware is normally dropped by silent installation vectors like drive-by downloads while PUP gets installed with the consent of the computer user, who knowingly or unknowingly approves the PUP installation on their computer system. But, there is no doubt that PUPs remain bad news for PC users as it could be quite dangerous to your computer in many ways.

The damage PUPs can do

The unwanted programs after installation display numerous annoying pop-up ads, trigger fake alerts, and sometimes even forces a computer owner to pay for the software. PUPs that come as browser add-ons and toolbars are commonly recognizable. These toolbars alter your homepage and your search engine in the installed web browser, track your web activities, modify your search results with redirects and sponsored links, and eventually slow down your browser and diminish your browsing experience. Potentially unwanted programs use aggressive distribution methods to get onto your computer. The worst part of setting up a PUP is the adware, spyware, and keystroke loggers that could lurk inside. Even if the PUPs really aren’t inherently malicious, these applications still do practically nothing good on your PC – they’ll take valuable system resources, slow down your PC, weaken your computer security, making your PC more vulnerable to malware.

How to avoid ‘crapware’

• Read the EULA thoroughly. Look for clauses that state that you have to accept advertising and pop-ups or bundled applications from the company. • Always opt for the custom if you’re offered an option between “Custom” and “Recommended” Installations – never ever click Next, Next, Next thoughtlessly. • Use a good anti-malware application. Try Safebytes Anti-malware which can find PUPs and treat them as malware by flagging them for deletion. • Be alert if you download and install freeware, open-source applications, or shareware. Do not ever install software applications that seem shady or malicious. • Always download applications from the original website. The majority of PUPs find their way onto your laptop or computer is via download portals, so steer clear of it altogether. Remember the fact that even though PUPs could potentially cause damage and hinder the proper functioning of the PC, they can’t enter into your system without your consent, so be alert not to provide them with it.

How One Can Get rid of Malware that is Blocking Websites or Preventing Downloads

Malware could potentially cause many kinds of damage to PCs, networks, and data. Some malware goes to great lengths to stop you from downloading or installing anything on your computer, especially antivirus software. If you’re reading this article, odds are you’re stuck with a malware infection that is preventing you to download or install the Safebytes Anti-Malware program on your PC. Even though this sort of problem can be tougher to circumvent, there are some steps you can take.

Make use of Safe Mode to resolve the issue

If the malware is set to run automatically when Microsoft Windows starts, stepping into safe mode could block the attempt. Just minimal required programs and services are loaded when you boot your computer in Safe Mode. To launch your Windows XP, Vista, or 7 computers in Safe Mode with Networking, do as instructed below. 1) Tap the F8 key repeatedly as soon as your PC boots, however, before the big Windows logo or black screen with white texts come up. This would invoke the Advanced Boot Options menu. 2) Choose Safe Mode with Networking with arrow keys and hit ENTER. 3) When this mode loads, you should have the internet. Now, obtain the malware removal program you want by utilizing the web browser. To install the program, follow the guidelines in the installation wizard. 4) Right after installation, do a full scan and allow the software program to get rid of the threats it detects.

Switch to an alternate internet browser

Some malware mainly targets certain browsers. If this is your situation, employ another internet browser as it might circumvent the computer virus. When you suspect that your Internet Explorer has been hijacked by a trojan or otherwise compromised by online hackers, the best thing to do is to switch over to an alternate internet browser such as Mozilla Firefox, Google Chrome, or Apple Safari to download your chosen security program – Safebytes Anti-Malware.

Create a portable USB antivirus for eliminating viruses

Another technique is to download and transfer an antivirus application from a clean computer to run a scan on the infected computer. Follow these steps to run the anti-malware on the affected computer. 1) Download the anti-malware on a virus-free PC. 2) Connect the flash drive to a USB slot on the clean computer. 3) Double click on the exe file to run the installation wizard. 4) Choose the USB stick as the location for saving the file. Follow the instructions on the screen to finish off the installation process. 5) Now, transfer the flash drive to the infected computer. 6) Run the Safebytes Anti-malware directly from the USB drive by double-clicking the icon. 7) Click the “Scan Now” button to start the virus scan.

Protect your PC from Malware With SafeBytes Security Suite

If you are looking to install an anti-malware program for your PC, there are lots of tools in the market to consider nonetheless, you just cannot trust blindly anyone, regardless of whether it is a paid or free program. A few of them are great but there are several scamware applications that pretend as authentic anti-malware programs waiting around to wreak havoc on your PC. You have to pick a company that develops industry-best anti-malware and it has earned a reputation as reliable. One of the highly recommended applications by industry analysts is SafeBytes Anti-Malware, the safest program for Microsoft Windows. SafeBytes can be described as a highly effective, real-time antivirus application that is made to assist the average computer user in protecting their PC from malicious internet threats. Through its cutting-edge technology, this software will help you protect your computer against infections brought on by various kinds of malware and other internet threats, including spyware, adware, trojans, worms, computer viruses, keyloggers, ransomware, and potentially unwanted program (PUPs).

There are many wonderful features you’ll get with this particular security product. Listed below are some of the features you will like in SafeBytes.

Active Protection: SafeBytes offers a completely hands-free active protection and is set to observe, block, and kill all computer threats at its very first encounter. It will check your PC for suspicious activity at all times and its unrivaled firewall shields your computer from illegal entry by the outside world. Robust, Anti-malware Protection: Using a critically acclaimed malware engine, SafeBytes offers multilayered protection which is made to catch and remove threats that are concealed deep inside your PC. Web Security: Safebytes allots all sites a unique safety ranking that helps you to get an idea of whether the webpage you’re just about to visit is safe to view or known to be a phishing site. Extremely Speed Scanning: SafeBytes’s virus scan engine is among the fastest and most efficient in the industry. It's targeted scanning significantly increases the catch rate for viruses which is embedded in various computer files. Lightweight: SafeBytes is really lightweight software. It consumes an extremely small amount of processing power as it runs in the background which means you will not observe any computer performance difficulties. 24/7 Support: For any technical concerns or product assistance, you may get 24/7 expert assistance via chat and email. To sum it up, SafeBytes Anti-Malware offers outstanding protection combined with an acceptable low system resources usage with both great malware detection and prevention. You now may realize that this particular tool does more than just scan and remove threats from your computer. You will get the best all-around protection for the money you pay on SafeBytes AntiMalware subscription, there’s no question about it.

Technical Details and Manual Removal (Advanced Users)

If you wish to do the removal of ChatZum manually rather than using an automated software tool, you can follow these simple steps: Navigate to the Windows Control Panel, click the “Add/Remove Programs” and there, choose the offending application to remove. In case of suspicious versions of web browser plug-ins, you can easily get rid of it through your web browser’s extension manager. You might also want to reset your home page and search providers, as well as delete browsing history, temporary files, and cookies. If you choose to manually remove the system files and Windows registry entries, use the following list to make sure you know exactly what files to remove before undertaking any actions. Please note that only advanced users should try to manually edit the system files mainly because removing any single vital registry entry results in a serious problem or even a PC crash. In addition, certain malware is capable of replicating itself or preventing its removal. Doing this malware-removal process in Safe Mode is recommended.
Files: Search And Delete: tbcore3.dll arrow_refresh.png basis.xml chatzum.dll info.txt inst.tmp loaderie.js suggestion_plugin.dll TbCommonUtils.dll tbcore3.dll tbhelper.dll TbHelper2.exe uninstall.exe uninstaller.exe update.exe Folders: C:\Program Files\ChatZum Toolbar\ C:\Documents and Settings\username\Application Data\Mozilla\Firefox\Profiles\gb5e8gtn.default\extensions\staged\ADFA33FD-16F5-4355-8504-DF4D664CFE83 Registry: Key HKLM\SOFTWARE\ChatZum Toolbar Key HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\ChatZum Toolbar
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Delete Downloaded, Failed and Pending Windows Updates in Windows 10
There are instances when instead of fixing problems the Windows Update brings you problems on your Windows 10 computer. You might even see some pending Windows Updates which for some reason, refuse to install no matter what you do. The good thing is you won’t have to deal with those failed and pending updates that are incompletely downloaded to your PC as you can actually delete them. Follow the instructions prepared below to delete the failed and pending Windows Updates.

Step 1: The first thing you have to do is delete all the contents in the Temporary folder

  • Tap the Win + R keys to open the Run dialog box.
  • Next, type in “%temp%” in the field and hit Enter or click OK to open the Temporary folder.
  • From there, select all the folders and files within the Temporary folder and then delete them all.
Note: %temp% is one of the many environment variables in Windows that could open the designated folder by Windows as the Temporary folder which is usually located at C:\Users[username]AppDataLocalTemp.

Step 2: Next, remove the pending.xml file

  • Go to the C:\Windows WinSxS folder.
  • Once you’ve opened the folder, look for a file named “pending.xml” file and right-click on it and you can either rename it or delete it.
  • After that, the Windows Update should delete the pending tasks and build a fresh new update.

Step 3: Delete all the contents of the SoftwareDistribution folder

The Software Distribution folder in the Windows operating system is a folder that can be found in the Windows directory and is used to store files temporarily which might be required to install the Windows Update on your PC. Thus, it is required by the Windows Update and maintained by WUAgent. Aside from that, it also contains all the Windows Update History files and once you delete them, you will most likely lose the Update history. As a result, the next time you run the Windows Update, it may result in a longer detection time.
  • Open the WinX Menu.
  • From there, open Command Prompt as admin.
  • Then type in the following command – don’t forget to hit Enter right after typing each one of them.
net stop wuauserv net stop bits
  • After entering these commands, it will stop the Windows Update Service and the Background Intelligent Transfer Service.
  • Next, got to the C:\Windows\Software\Distribution folder and get rid of all the folders and files thereby tapping the Ctrl + A keys to select them all and then click on Delete. Note that if the files are in use, you won’t be able to delete them.
  • Once all the contents in the Software Distribution folder are deleted, restart your PC and then go back to Command Prompt and input the following commands again.
net start wuauserv net start bits
Since the folder has already been flushed, it will be populated afresh the instant your restart your computer and open Windows Update.

Step 4: Try resetting the catroot2 folder

You can also try resetting the catroort2 folder as it is known to fix tons of Windows Update issues. Both the Catroot and catroot2 are Windows operating system folders that are required for the Windows update process.  So when you run the Windows Update, the catroort2 folders stores the signatures of the Windows Update package and helps it in the installation. It makes use of the “%windir%System32catroot2edb.log” file in the updating process. Afterward, the updates are stored in the SoftwareDistribution folder which is used then by the Automatic Updates in order to execute the updating process. Keep in mind that you must not rename or delete the Catroot folder. Although the Catroot2 folder is recreated automatically by Windows, the Catroot folder isn’t.
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