BSOD c000021a Fatal Error. Pls Help


  1. Bolvua
    Posts : 3
    Windows 7 Ultimate x64
       New #1

    BSOD c000021a Fatal Error. Pls Help


    Hello Guys.
    I have this problem a few days. I tried a lot of thinks what I found on internet but nothing works,
    I m really tired. Please help me. I need my computer back, because I have a lot programs in there.

    I think that this problem started when I connect second monitor in HDMI. Is it possible?
    I have AMD/ATI HD5670.

    Full sub.
    STOP: c000021a {Fatal System Error}
    The verification of a knownDLL failed. system process terminated unexpectedly with a status of 0xc0000020 (0x001f9660 0x00000000)
    The system has been shutdown.
      My Computer
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  3. Arc
    Posts : 35,373
    Microsoft Windows 10 Pro Insider Preview 64-bit
       New #2

    Does it not boot to windows at all? If so, try Advanced Boot Options > Last Know Good Configuration (advanced). Does it boot now?

    Bolvua said:
    I think that this problem started when I connect second monitor in HDMI. Is it possible?
    Yes, any change in the configuration may cause it.

    Sometimes this issue may occur during running the computer and the user can boot to windows back. If so, post it following the Blue Screen of Death (BSOD) Posting Instructions.
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  4. Bolvua
    Posts : 3
    Windows 7 Ultimate x64
    Thread Starter
       New #3

    Not working


    Yes I tried this. And still BSOD.
    I also tried restore from restore point but repaire saying no restore point found on computer
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  6. Arc
    Posts : 35,373
    Microsoft Windows 10 Pro Insider Preview 64-bit
       New #4

    We are still in dark at the very basic.

    Does the BSOD happen during boot and makes the system unbootable at all? Or does the BSOD happen during running the computer?

    Not working is not a reply to get any information from; and system restore was not suggested.
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  7. Bolvua
    Posts : 3
    Windows 7 Ultimate x64
    Thread Starter
       New #5

    So the BSOD happen during boot and makes the system unbootable. I tried safe mode and also BSOD.

    Sorry for my low english.
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  8. Arc
    Posts : 35,373
    Microsoft Windows 10 Pro Insider Preview 64-bit
       New #6

    Bolvua said:
    So the BSOD happen during boot and makes the system unbootable. I tried safe mode and also BSOD.

    Sorry for my low english.
    I would request gregrocker to guide you.
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  10. gregrocker
    Posts : 50,642
       New #7

    Work through the steps for Troubleshooting Windows 7 Failure to Boot including the hardware tests. Report back as you go as there may be other steps indicated.
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  11. Arc
    Posts : 35,373
    Microsoft Windows 10 Pro Insider Preview 64-bit
       New #8

    Thank you Greg. :)
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