Windows 8 and 8.1 Forums


Lost ownership of C: Access denied

  1. #1


    Posts : 4
    windows 8

    Lost ownership of C: Access denied


    I have used W8 since over 1 month with no problems. Suddenly I have lost ownership of c:. In my user account I am still Administrator. I can still use the computer but am very limited. When I try to open the taskmanager I get the error "Windows cannot access C:\windows\system32\taskmgr.exe".
    In safe mode I look for permissions for local disk c: It says that "No groups or users have permission to access this object."
    How can I regain ownership of c:?

      My System SpecsSystem Spec

  2. #2


    Harrisonburg, Va.
    Posts : 10,488
    Windows 8.1.1 Pro with Media Center


    Quote Originally Posted by rollanders View Post
    I have used W8 since over 1 month with no problems. Suddenly I have lost ownership of c:. In my user account I am still Administrator. I can still use the computer but am very limited. When I try to open the taskmanager I get the error "Windows cannot access C:\windows\system32\taskmgr.exe".
    In safe mode I look for permissions for local disk c: It says that "No groups or users have permission to access this object."
    How can I regain ownership of c:?
    Maybe right click/Take Ownership ?

    Click image for larger version

    Click image for larger version
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  3. #3


    Posts : 4
    windows 8


    Unfortunately that alternative is not present when I rightclick. And when I left-click I get the error "C:\ is not accessible. Access denied." If I rightclick and choose "Properties" I get the message "You must have read permissions to view the properties of this object". If I choose Advanced I get "Unable to display current owner".
      My System SpecsSystem Spec

  4. #4


    Posts : 835
    Win 8.1 Pro


    DO NOT, i repeat, DO NOT take ownership of the c: drive as advised above.

    Best thing to do, is try to create a new admin user and login to that and see what happens.

    If that doesn't work, the best thing you can do, is back up your data and reload/reset Windows.

    Reason...

    Taking Ownership of the C Drive will cause you a ton of problems. It will break windows. Never do it.
    Especially with the TakeOwnership Hack.

    Besides not having access to C: drive, there are more tan likely a whole bunch of other stuff that is messed up as well.
    The only way to correct this is to try a restore, reset or reinstall of Windows to correct all the permissions that have been broken.
      My System SpecsSystem Spec

  5. #5


    Posts : 4
    windows 8


    I do not have the rights to create a new user- although I am Administrator. I tried to refresh but got an error It looks like something didn't load correctly...... Error code: 80070490
    I found some references for this code for Vista and W7 but not W8. I think I have to give it up and reinstall.
      My System SpecsSystem Spec

  6. #6


    Posts : 4
    windows 8


    I finally solved the problem. I have dual boot windows 7. In w7 the partition was also unaccessible, but I could change and add new users. Sop I added myself and all corresponding users from W7 c:-drive. After rebooting I was back in business. I do not understand what happended. May the dual-boot have created it?
      My System SpecsSystem Spec

  7. #7


    Harrisonburg, Va.
    Posts : 10,488
    Windows 8.1.1 Pro with Media Center


    Quote Originally Posted by Tepid View Post
    DO NOT, i repeat, DO NOT take ownership of the c: drive as advised above.

    Best thing to do, is try to create a new admin user and login to that and see what happens.

    If that doesn't work, the best thing you can do, is back up your data and reload/reset Windows.

    Reason...

    Taking Ownership of the C Drive will cause you a ton of problems. It will break windows. Never do it.
    Especially with the TakeOwnership Hack.

    Besides not having access to C: drive, there are more tan likely a whole bunch of other stuff that is messed up as well.
    The only way to correct this is to try a restore, reset or reinstall of Windows to correct all the permissions that have been broken.

    Before I took ownership of C:\ , I made factory default backup on thumb drive.
    I have a factory default backup drive on the computer.
    I made a Restore Point.
    I can download a copy of Win 8 Pro & re-install it using my present product code.

    Since taking ownership of C:\, I have experienced no problems what-so-ever.
    I did not "advise", I put the idea out for consideration.

    It is not a "Hack".It is a legitimate option provided by Microsoft.


    This page "might" be of use.I'm just putting the idea out there for consideration.
    Microsoft Support
      My System SpecsSystem Spec

  8. #8


    Posts : 835
    Win 8.1 Pro


    Yes, it is a legitimate option, I am aware of that. I call it a hack cause it's not a mainstream thing and not everyone should use it.

    Taking complete Ownership of the C drive WILL cause problems in the long run.
      My System SpecsSystem Spec

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