Why my hp desktop keep turning off error c000021a

http://search.microsoft.com/en-us/supportresults.aspx?form=mssupport&q=c000021a

Switch ON the PC, boot the PC in 'Safe Mode' by continuously tapping F8 button after you switch On.

Let windows boot in Safe Mode and log in to windows.

Go to 'Start'--->Programs--->Accessories--->System Tools--->System Restore

Here you will have to check "Restore computer to an earlier time' and click Next
Now you will find one Month Calendar window with Dates below, go to the last month by clicking the '<' sign in the upper left hand corner of the Month Calendar and select any date that you see in Bold.

Click on Next and System Restore will start and windows will take a reboot.

After reboot your problem should be resolved.

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It appears that your Windows Registry is corrupted. You can try to use a Registry repair utility like CCleane to fix it. If that doesn't work you will have to reload Windows OS (Operating System). For more info no this error code Google "c000021a".

The errors in computers make it miserable for their users to use them. They face so many problems when computers do not perform as intended. A very common error, which computer users can face, is the c000021a fatal system error.
This error is produced when it found by Windows NT kernel that either of the two processes Csrss.exe or Winlogon.exe has failed. Such processes could have stopped working due to many reasons like misaligned files being installed on the PC and a faulty restoration of files at the place where they were being used. In the event of such a situation, the Windows NT kernel stops the system and the stop c000021a fatal system error message is produced on the screen. This kind of a fatal exception happens when the PC can't tackle an exception and the program showing it needs to be closed.
This kind of a c000021a unknown hard error can be resolved by uninstalling the software that is not as per the needs of your PC. One can remove all the unwanted files present on the PC. An upgrade of the PC's operating system is also an alternative to restore it to its working condition and fix the stop c000021a unknown hard error.
The second solution to fix c000021a error from your computer is also very simple. You do not need to feel much hassled because of it. Just restart the computer. When the computer is booted, press the F8 button. Choose the last known good configuration and then press enter. This error generally happens when some software or hardware has been installed that is not as per the specifications of the PC. Therefore, after selecting the operating system you want for booting, the C000021a error will have been removed from your system.
However, it is better to utilize a registry cleaner software when the error still does not go away.
Windows registry includes all the information that is used by this operating system for carrying on with any operations like creation of documents. Windows Kernel uses all this information for executing the applications.
Registry cleaner software can ensure that the registry is cleaned of all the bad entries which have been causing an improper execution of files by Windows Kernel. Using this software is one of the most effective ways to fix the c000021a fatal system error. It can clean the registry without deleting any useful items from it which can lead to production of further errors.

Fix C000021a Fatal System Error is easy to do with registry cleaner. If you Scan Your Computer it will detect all the errors in your registry and safely remove them.

There are lots of possibilities like faulty ram or may be virus in the system or may be the windows file is corrupt try to repair the windows installation. or take the backup of system and the format the system

In my experience, your computer's hard drive might be fried. I took a couple computer architecture classes and this seems to be the most reasonable answer. if I were you, i would find a computer technician just to be sure. Hope this helps, good luck
here are a few websites that might help
http://healyourchurchwebsite.com/2008/03/14/how-i-fixed-my-stop-c000021a-fatal-system-error-with-knoppix/

http://forums.techarena.in/windows-xp-support/771529.htm

hello there
here is some information that should be able to explain this error and how to fix it ok?
best regards michael

1. How to troubleshoot a "STOP 0xC000021A" error ... presents advanced troubleshooting steps for the STOP 0xC000021A error. ... STOP: c000021a {Fatal ... Note Most STOP 0xC000021A errors occur because Winlogon. ...support.microsoft.com/kb/156669
2. "STOP: c000021a (Fatal System Error)" Error! RE: "STOP: c000021a (Fatal System Error)" Error! Ya, thats what I thought I might have to do ... RE: "STOP: c000021a (Fatal System Error)" Error! just input the ...www.msghelp.net/showthread.php?tid=66202 - 52k - Cached
3. How I fixed my Windows XP Stop c000021a {Fatal System Error} with ... How I fixed my Windows XP Stop c000021a {Fatal System Error} with Knoppix Linux. 2008 March 14 ... Message: Stop c000021a {Fatal System Error} The Session ...healyourchurchwebsite.com/2008/03/14/how-i-fixed-my-stop-c000021a-f... - 53k - Cached

usually blue screen comes from unstable video memory or windows system or HD.
you may try
1) reinstall windows
2) change another HD to install windows
3) change new ram memory or change memories slot between one and another
if not fixed, to be sure your video memory damage which is insualted on board(separated with RAM), only the hardware repair can be fixed.

Hi, satagoe, That error means there is a error in memory block c000021a

reinstall the operating system.





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