Windows 8 Pro cannot boot - Error 0xC000021a

Anonymous
2012-11-25T18:10:13+00:00

Hi

I upgraded my son's laptop from Windows 7 to Windows 8 Pro. I has been working fine for a few weeks. But now when booting It halts iwth the error code 0xc000021a. I have tried the following options

Refresh - this fails with the error 0xc000021a

System Restore - this fails with 0xc000021a

Safe mode boot does not work

I can start the cmd console

Any suggestions as to how to proceed?

Windows for home | Previous Windows versions | Performance and system failures

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  1. Anonymous
    2015-03-09T14:20:39+00:00

    I DID THIS COMMAND FROM

    X:\

    ALL BY ITSELF. TO CHANGE DIRECTORY TYPE: cd x:\ AND THEN PRESS ENTER

    ALSO SO YOU DON'T HAVE TO TYPE EVERYTHING OUT EACH TIME IN CMD, IF YOU HIT UP ON THE ARROW KEY IT SHOWS YOU WHAT THE LAST THING YOU TYPED WAS SO JUST HIT UP CHANGE THE #'S FOR EACH UPDATE AND THE VERSION #'S ON THE END AND HIT ENTER AND REPEAT UNTIL YOU HAVE UNINSTALLED THE UPDATE THAT HAS CAUSED EVERYONE HERE A HUGE HEADACHE.

    I'VE GOT PRETTY DEEP INTO COMPUTER REPAIR RESEARCH BEFORE AND THIS ONE IS PRETTY BAD. GOOD LUCK.

    MESSAGE IF YOU HAVE QUESTIONS. I ONLY HAVE ABOUT 15-20 UPDATES SINCE IT RUNED 2015 SO IM DELETING ALL OF THEM WHICH IS HELPFUL JUST CHECK THE YEAR.

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  3. Anonymous
    2015-03-09T10:05:58+00:00

    how do you do that exactly? I only have blue screem that lets me get to advanced options, I go to startup settings. restarts to a blue screen and #7 is disable driver signature enforcement. hit 7 , restarts and it just comes back to the blue screen that says "were collecting some repair info" or whatever and restarts again.

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  4. Anonymous
    2015-03-09T07:32:47+00:00

    Hi Yuri. 

    I try the command : DISM .... Cleanup-image ... 

    The CMD box give : Error : 1639 

    ?

    Thanks  in advance

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  5. Anonymous
    2015-02-13T11:22:48+00:00

    Hi

    I used advanced boot menu on system startup options pressing F8 just after turning on my laptop. when advanced boot menu showed up, there are some options you can select. i selected "force drivers to have signature disabled..." and boot continued and the problem was gone.

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