Stop: c000021a {fatal system error}

This is not an easy one to deal with if you don't have some things like a boot disk. The error is most likely caused by something that was installed or restored wrong. The best windows option is to use F8 and select last known good config. Then if it starts you can uninstall any software that you added just before this error..IF you cannot do that then you need to be able to boot to a separated disk and use file utilities to remove any programs that might be causing this.

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.

If you feel that my answer has helped you in any way then please give a vote.

sounds like the driver you updated is causing it to shut down.try and start in safe mode and see if you can sort it from there.

If you attempt to install a piece of hardware or software on your PC computer that is incompatible with your system, you may see a blue screen with a C000021a fatal error warning. The easiest way to recover the Windows operating system from this type of error is to restore your computer to a previously working state.
1.Press the "F8" key on your keyboard when prompted during the boot process.

2.Use the up-and-down arrow keys to highlight the "Last Known Good Configuration" option. Then hit "Enter.
3.Use the up-and-down arrow keys to highlight the operating system version that you wish to boot up to, and then hit "Enter" again. The system will now restart to the last working version of your operating system, which will eliminate the C000021a fatal error.
Hope this helps

BSOD - blue screen of death....sorry mate but its seems that a fatal error on your operating system occured....most probably a sure way to fix this is to re-install windows, and lose everything on the hard drive...

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

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The first thing you should do is back up the HDD, Remove the HDD from your Laptop, you find the lid that opens the HDD access slot under the laptop or ask someone who knows how. if available there are aftermarket 2.5 HD enclosures that lets you install the 2.5 in.hdd of your laptop via a usb. you can plug the usb to a desktop PC and backup your files. then reformat your hdd. reinstall the hdd to your laptop. replace your memory ram which causes the blue screen with a new ram, reinstall the OS.

Can you log in as Administrator with a capitol A and no password?
Or Last known good configuration?
Or safe mode with comand prompt?

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.

If that is not it reistall and to not loose you files click you partion durring the install and do not format it and click enter then click on leave partion alone