BSOD during boot up, Bugcheck c000021a

  1.    #1

    BSOD during boot up, Bugcheck c000021a

    Hello everyone.
    If you want to know system specs of a laptop, you can take a look at my profile.
    Today, I got this laptop from a friend who told me that it is running slowly. And it was actually extremely slow running. I was then searching for a potential problem when I realized that there is a "checking for updates" loop in Windows Update, which I was trying to solve.

    • First thing I've done was setting up a clean boot and eventually sfc /scannow in safe mode with command prompt. The result: corrupt files were fixed successfully. Restart
    • Now, another problem I'm facing now is BSOD during boot, error 0x000021a. The only way I can boot into fully-operating system is to go to advanced startup options and choose option number 7 - Disable driver signature enforcement.
    • After "normal" boot up, I ran a DISM checkhealth, scanhealth which told me that there were not any errors or corrupted files.
    • Because there is a problem with Windows update, I followed the steps from here and ran the .bat file, now I see the date when the last check of updates has been running but I haven't pressed the "check for updates" button yet.
    • I've tried to update drivers from Lenovo website but it seems that it doesn't resolve the problem. Although the computer runs pretty fast now, I think it is due to the fact that I'm working in a clean boot environment.
    • Lenovo Solution Center also can't execute the hardware scan, I just get the orange window with white exclamation mark, but without any text or reference.

    I would like to ask you to help me to figure out what is the actual problem. Before I removed the history of windows update I saw that one of the last installation was update of AMD graphics drivers, which was failed, so I think it could be the major problem here.
    I ran sfc /scannow again right now, I got the same result like the first time. Corrupt files, fixed with success.
    Thank you very much.
    Last edited by Dobroslav; 09 Jul 2017 at 16:50. Reason: reattachment
      My ComputerSystem Spec

  2. Posts : 26,465
    windows 10 professional version 1607 build 14393.969 64 bit

    Rule 4No piracy or discussion of piracy allowed at all. Such as software, music, videos and other intellectual property violations (e.g. downloading youtube videos locally etc) - it is forum policy that no help shall be given to people who knowingly steal software or services.One of the main reasons for this is that the act of pirating the software will inevitably change the working of the software and make investigation and repair impossible. Please install a legitimate copy of the software and if you are still experiencing the issue we will be please to assist - No further assistance will be provided until we are satisfied that the software is genuine.
      My ComputerSystem Spec


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