C000021a Error Causes and Fixes | PC Common Errors | at windowsxpregistrycleaner.com

There are many reasons to cause the windows c000021a error, and we have summarized and collected some informations to fix this problem. Please read below:

Causes and Fixes

Cause 1: You have installed a new software and when you start your computer, you may get the blue screen error and receive a error:" STOP: C000021a Unknown Hard Error Unknown Hard Error" and then crashed. After restarting the computer, there is a error message "drwtsn32.exe encountered a problem and needs to close" on your computer desktop, when you close it the computer will restart again.

Fix: Because your pc runs properly before installing the new software, this problem should be caused by this software. First to start your computer in safe mode, and uninstall the recently installed or updated software. Then restart the computer, the problem disappears, this error is caused by the installed software which is not compatible with your system.

Cause 2: When you start your Windows 7 system, you may get a blue screen error:" STOP: C000021a {Fatal System Error} ....... The system has been shut down".

Fix: Many reasons may cause the windows fatal error, please use the following steps to try to solve this windows stop problem:

1) If you can log on the computer: After starting the computer, press F8, select the "Safe Mode", use the "Last Known Good Configuration" option to restore to a point in time when the computer is running normally.

2) If it doesn't work for you, logon in safe mode and full scan your pc with the Anti-virus software, the virus also can make this blue screen problems.

3) If still not work, remove the graphics card and memory and wipe them with a eraser, then clean the dust of the CPU fan and memory slots with a brush.

4) Think for a moment, have you installed two or more than two similar softwares on your system (two Anti-virus softwares, players or others)? Maybe they are not "compatible" on the same pc, you need to uninstall one of them.

5) Not work? Please use the pc repair tools to update drivers and repair your registry errors, many pc errors are caused by these.

6) If the all the above steps don't work for you, maybe you need to reinstall your system.
Fix it from microsoft.com

Please click here to search the help links to fix BSOD c000021a problem on microsoft support.

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PC repair tool to fix stop c000021a errors

If you still haven't fixed the windows error code c000021a problem:

1. Please try the tool windows registry optimizer, it safely cleans PC errors & invalid entries cause slow speed, blue screen, deadlock errors and crashing, and repair registry problems to speedup your computer performances. It is easy to use. And you can scan your PC errors for free first!

2. Some pc error is related to driver problems, Driver Update software is designed to quickly locate the most current drivers specific to your computer system, you can run a free scan for your pc driver update first.

That is we find the help informations to fix computer system stop blue screen error c000021a, hope our page is helpful to you, if you still haven't fixed this errors, please contact microsoft support for further help.

www.tune-up.com

(Simple Steps:>>Download >>Install >>Free Scan >>Repair. that's all.)

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