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
    2015-01-19T21:13:39+00:00

    Hi Yuri,

    Thanks for this. It worked for me on an HP G70 laptop that had been upgraded from Vista to Win7 to Win8 many months ago and would not start a few days ago after a  Windows update. I tried other suggestions in this forum without success but this did the trick. Thanks again!

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  2. Anonymous
    2015-02-12T07:38:51+00:00

    Hi, I am using the Win 10 preview 9926.  This particular error has hit several times.  Normally I simply do a normal reboot and it clears itself.  This happens to me with the preview a couple of time a month, sometime more.

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