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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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Tip 16: Dictate, not type.

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Tip 17: Use sandbox.

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Tip 18: Use a hidden game bar.

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The Windows installer service is responsible for installing pending updates that get downloaded by the Windows Update component. If this service is disabled on your configuration, none of the updates waiting to get installed will get completed.
  1. Press ⊞ WINDOWS + R to open up a Run dialog box. Inside the text box, type ‘services.msc’ and press ENTER to open up the Services utility.
  2. Once you’re inside the Services screen, move over to the right-hand tab of the screen, scroll down through the list of services and locate the Windows Installer service. When you find it, right-click on it and choose Properties from the context menu that just appeared.
  3. Once you are inside the Properties screen of the Windows Installer services, access the General tab, click on the Start button to force-start the service. Note: If you can, also change the Startup type to Automatic via the associated drop-down menu. However, depending on your administrator settings, this might not be possible.
  4. Restart your computer and wait for the next startup to complete. Once your PC boots back up, attempt to reinstall the driver that was previously triggering the 0x800705b3 error and see if the issue is now fixed.

Performing a Winsock Reset

In case the 0x800705b3 error is related to some kind of network inconsistency (TCP or IP related), you might see Windows Updates failing due to bad data that forces the Windows to abort the installation of new pending updates. In this case, you should proceed by doing a complete Winsock reset procedure to fix the majority of the socket and temporary data-related issues that might cause this behavior. Several affected users have confirmed that this method was the only thing that allowed them to finally fix the Windows Update issue and install pending updates normally. Here are some step-by-step instructions that will walk you through the process of performing Winsock Reset:
  1. Open up a Run dialog box by pressing ⊞ WINDOWS + R. Inside the text box, type ‘cmd’, then press CTRL + SHIFT + ENTER to open up an elevated Command Prompt. Accessing an elevated CMD prompt Note: When prompted by the UAC (User Account Control) prompt, click Yes to grant admin access.
  2. Inside the elevated CMD prompt, type and taste the following commands in order and press ENTER after each one to effectively reset the TCP and IP data that might be responsible for the apparition of the 0x800705b3 error code:
    nbtstat -R
    nbtstat -RR
    netsh int reset all
    netsh int ip reset
    netsh winsock reset
  3. Once every command above is processed successfully, you can go ahead and close the elevated Command Prompt and reboot your computer.
  4. After the next startup is complete, repeat the installation of the Windows Update that was previously failing and see if the issue is now fixed.

Performing SFC and DISM Scans

If none of the ‘superficial’ causes have worked in your case, you should start considering some type of system corruption that might affect your computer’s ability to complete pending updates that are currently waiting to be installed. In case you find yourself in this particular scenario, you should run a couple of built-in utilities capable of fixing corrupted instances that might be currently affecting the Windows Update component. Our recommendation is to start with a simple System File Checker scan. An SFC scan will cross-check every Windows File against a local archive that maintains healthy copies. In case corrupted instances are found, this utility will swap the corrupted instance with the healthy equivalent.

Performing an SFC scan

Once the SFC scan is complete, reboot your computer and wait for the next startup to complete. After your computer boots back up, initiate a DISM scan. This utility works differently in the sense that it relies on a sub-component of Windows Update to download healthy copies for the corrupted Windows files that need to be replaced. Because of this, it’s important to make sure that you have a reliable Internet connection before initiating this operation.

Doing a DISM scan

After the DISM scan is complete, reboot your computer one final time and see if the issue is fixed once the next startup is complete.
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How to Fix Fatal Error c000021a

Fatal Error c000021a - What is it?

Fatal Error c000021a is a type of Windows stop error also known as the blue screen of death (BSoD) error. When this error occurs, it causes the computer screen to go blue and locks the user out of the current activity. This error code is fatal and can lead to serious issues like system crashes and freeze. The error code is usually displayed in the following format:
STOP: c000021a {Fatal System Error} The Windows Logon Process system process terminated unexpectedly with a status of 0xc0000034 (0x00000000 0x0000000)

Solution

Restoro box imageError Causes

Fatal Error c000021a occurs when the Windows kernel detects that either Winlogon.exe or Csrss.exe service processes have stopped responding or failed to load.  When this happens the error code pops up on the screen. Nonetheless, this is not the only reason for the occurrence of this error. There are plenty more reasons why Fatal Error c000021a may pop on your computer screen. These include:
  • Missing or corrupt hardware drivers
  • Faulty hardware
  • Windows System Restore failed during the rollback process
  • Malware or viral infection
  • Registry issues
No matter what the reason may be, it is advisable to fix the error right away without any delays. Remember it is a fatal error and can cause a great deal of damage to your PC.

Further Information and Manual Repair

Fatal Error c000021a is a serious PC issue but this does not mean you have to hire an expert to get it fixed. The good news is that this error is actually quite easy to resolve. You don’t have to be a technical whiz or a computer programmer to fix Fatal Error c000021a on your PC. Here are some do it yourself methods to fix this error code right away without any hassle: Let’s get started:

Method 1: Update Your PC Drivers

As we mentioned about corrupt or missing drivers can be one of the many reasons for the occurrence of this error. So, check the drivers first. Perform a driver scan and make sure all your drivers are updated.

Method 2: Perform a Windows System Restore

To do this, first launch Task Manager by pressing CTRL+SHIFT+ESC on your keyboard. Now click on the application tab and then click ‘New Task’ then browse. After that, go to C:\Windows\System32\Restore  folder and then double click the rstrui.exe file. This will help start system restoration. Your computer will reboot during the process and hopefully, the error will be resolved. Nonetheless, if the error still persists then try methods 3 and 4.

Method 3: Scan for Viruses

Sometimes Fatal Error c000021a may also occur due to malware infection. Your PC may be affected by viruses hidden in different locations without you knowing about it. Therefore to resolve this error, it is recommended to run an antivirus and scan for viruses. If detected, remove them right away to fix the error code.

Method 4: Repair the Registry

Another method to resolve Fatal Error c000021a code on your system is to repair the registry. The registry stores all the information and activities performed on the system. If it is not cleaned frequently, it gets loaded with too many files unnecessary and obsolete files like the junk files, cookies, internet history and temporary files which corrupts and damages the registry thereby generating blue screen of death error codes like Fatal Error c000021a. Though you can repair the registry manually it can be both time-consuming and slightly difficult especially if you are not a computer programmer. Therefore it is advisable to download a registry cleaner to fix it right away.

Automatic Repair with Restoro.

Whether the Fatal Error c000021a code occurs due to viral infection or registry issues, download Restoro. This is a next-generation, advanced, and multi-functional PC Fixer. This software is deployed with multiple utilities such as a powerful registry cleaner, an antivirus, a system optimizer, and more. The registry cleaner scans the entire PC and detects all types of registry issues at once. It cleans the registry, wipes out all the unnecessary files, and restores the registry back to normal. Simultaneously, the antivirus embedded in this software detects all types of viruses including malware, adware, spyware and Trojans and removes them in seconds. The system optimizer feature ensures the speed and performance of your PC are not compromised during the repairing process. It ensures your PC works at its optimal speed. Restoro is a one-stop solution for all your PC needs. It has a user-friendly interface making it easy for all levels of users to work around. It is compatible with all Windows versions Click here to download Restoro and resolve the Fatal Error c000021a code on your PC today!
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Remove ChatZum from Windows

ChatZum is a Potentially Unwanted Program that installs a Toolbar into your browser. This program allegedly allows users to zoom in on photos without clicking on them, however, upon further research, it was discovered that this function does not work on the latest version of browsers.

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.

Several anti-virus applications have marked this program as Potentially Unwanted, and it is not recommended to keep it on your computer, especially considering the fact it will most likely not work on your browser.

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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