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How To Fix Windows 8 Error 0xC000021A

by RegMender Editorial Team on Nov.28, 2012, under Windows 8 Error

While you are upgrading the computer from Windows 7 to Windows 8, you may receive the following Windows 8 error 0xc000021a message:

STOP: c000021a {Fatal System Error}
The Windows SubSystem system process terminated unexpectedly with a status of 0xc0000005(0×7e74ae01 0×0053f3c8)
The system has been shut down.

This above issue is always caused by failed Winlogon.exe or Csrss.exe, which stops the Windows and raises the error 0xc000021a. To fix the error, try the following steps:

  1. Click the "start" button, and type "cmd" in the search box.
  2. In the new Command windows, type "System Root\System32\Drwtsn32.exe -I" to register Dr. Watson as the default system debugger, and then press Enter.
  3. Typ "System Root\System32\Drwtsn32.exe", and then choose the options below:
    • Append to existing log file
    • Create crash dump
    • Visual Notification
  4. Restart the computer, and press F8 at the indicated time.
  5. Choose "Last Known Good Configuration" with the arrow keys, and then press Enter.
  6. Highlight an operating system with the arrow keys, and then press Enter.
  7. Restart the computer again to log in normal mode, and upgrade the Windows again.

-- Download How To Fix Windows 8 Error 0xC000021A as PDF --


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15 Comments on How To Fix Windows 8 Error 0xC000021A

  • Alexsandro
    But , my machine cant complete boot because of this error.So I cant do this step
  • rafael
    Windows 8 when turning my pc on I see the windows logo and dotted circles moving taking to a sideways sad face and mentioning error 0xc00021a, then it restarts itself to automatic repair just to take to the blue background boot option where I only get troubleshoot and shut my pc.On troubleshoot I get refresh, reset, advance options.If I refresh I get - the drive where windows is installed is locked. unlock the drive and try again.If I reset I get - unable to reset your pc. a required drive partition is missing.On advanced options I get sys restore, sys image recovery, automatic repair, command prompt.If I restore I get - to use sys restore you mus specify which windows installation to restore. restart the computer, select an operating system and then select system restore.If I image recover I get - an internal error ocurred. the system cannot find the file specified (0x80070002)If I automatic repair I get back to the blue background boot option screen.Command Prompt mentions x:\windows\system32\cmd.exe and won´t let me change neither drive letter on the alphabet.My new PC is unaccessible and useless... Microsoft level 2 technical support has not called back.
  • rafael
    I have the windows 8 cd inside an external dvd rom connected to my all in one vizio pc when starting and restarting.
  • stacy
    Mine says 'system' is not recognized as an internal or external command, operable program or batch file when I enter this at command
  • Paul R.
    I have the same error, and it will not login to Windows and go the the desktop. I need a fix from the command line.
  • 8?no tks
    Windows 8?, what a crap!. It's a maked up win 7, which is of course better.I've been testing W8 for about two months; without installing programs, except Firefox, but a few days ago W8 warned me that my HD had a disk error and it had made some corrections to solve the problem, but it was necessary to reboot th machine. Before rebooting, I installed WD DL tools to check HD health, and it was ok, so I reboot the computer; that was the W8 death.Since then, W8 is always showing automatic repair but never repairs nothing. Thanks God I was only testing this new crappy OS.
  • Jakub
    Can it fix by reinstal windows 8 or go back to win7?
  • Devon
    I installed McAfee yesterday morning and I noticed that throughout the evening whenever I'd unplug/plug the adapter in my laptop or whenever I'd put it into hibernation I would get an error. It said something like "Microsoft Visual C ++ Runtime Library" and "Program: c\windows\sytem32\atibtmon.exe". Yesterday I decided to refresh my laptop because most of my Modern apps would crash or hang and after I refreshed it and restarted my laptop I got a blue screen. The error code is 0xc000021a
  • Shobhit
    I am also facing the same issue. Two days back it suddenly warned me about some disk errors and wanted me to restart it. When it restarted it statred automatic repair, it repired disk errors for almost an hour and then showed that repairing failed. Now everytime it crashes with error 0xc000021a and restarts. I have tried everything, refreshing, reseting, system restore, safe mode, etc. but nothing is working.Kindly help asap.
  • deFENCE_
    Hi, I got an upgrade from Win7 to 8, I installed it yeaterday, it boots with the window thing and then shows me a sad face with error code 0xc000021a and then reboots and restores Win7. THIS MAKES ME SAD ;-(!I try to keep only the user data now (second option in the installer)-deFENCE_
  • David
    There is no Drwtsn in Windows 7 Ultimate. So, this solution won't work if someone has a clean install of Windows 7 Ultimate.And, "System Root" should be typed as %systemroot%. That is C:\Windows for short, for anyone interested. ;-)
  • Markus
    I bought HP ENVY h8-1443eo a week ago. On first boot it installed and configured Windows 8. It felt fast and games run very fast. Then the problems started. First Windows installed some updates and something went terribly wrong. Based on googling I would say it was Norton Internet Security and Windows conflict. Then I started to warnings to event log. Total of 110000 in two days. IIRC my googling, it wasn't fatal. But then many programs didn't start anymore, most vitally explorer. I just got empty window and waiting mouse indicator. And this applied to practically all critical system applications like control panel, windows update etc.. after desperate googling I ended to boot to recovery application (or what ever they call that startup stuff when you press F11 at startup). Tried to refresh and other tricks. All failed. Finally I picked to revocery from latest good configuration. It took a while and then notification and it was succesfull and reboot is needed. and BANG. Ended to this useless error code. Windows tries to fix itself at boot, no success.After wasting one day for this mess and experiments for one week, I have to say that Windows 8 is the biggest mistake in my software life so far. If this doesn't get better very fast, their 20+ years journey will be history. I guess it is now really time to start to use desktop Linux seriously. There you can try to fix the problems, rather than to look useless error messages or read forums where people solve issues by "reinstalling the whole OS every now and then".
  • Ed
    Windows seem to boot normal but after it's fully started i have a black screen with only the mouse cursor.Nothing else.But if i press control-alt-delete i get the menu to shut-down change user, logoff etcFrom there i can get into system to see all processess running etc.Via file, new i can start the elevated dos box and through some good old dos commands i can even start some applications such as firefox. However they will start but without bookmarks or plug ins.I have started easeus partition master to see if i could restore or check the partition but no effect here.I started chkdsk but,although it seemed promising when it told me it was repairing the drive, the result remained the same.I downloaded and was able to install and run through some dos commands ccleaner, hoping this was all just a buggy register issue. It fixed a lot (so it told me) but no result upon a restart.I have also booted from the windows 8 dvd and tried every option (repair, refresh) but no result either. It tells it cannot be done.So now i am stuck with a workaround dos PC without a properly running OS. I downloaded the windows 8 pro as i purchased it online and the code is my e-mail which i cannot acces. Stupid me ofcourse never printed it out on paper just in case. So i do have the windows 8 pro disc but i am unable to install because i don't have acces to the registration code which is required for a reinstall.Anyway, i will keep on searching for a solution as reinstalling is not something i look forward to and actually not an option. I feel it must be something relatively simple. (actually it should read i hope) but in the meantime i could use any ideas. In my case it is drwatson.exe but this doesnot do anything at all. It seems like drwatson is starting but nothing happens.

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