1.    12 Nov 2015 #1
    Join Date : Nov 2015
    Posts : 3
    windows 10

    I changed permissions on all files on C: drive now I get black screen

    Windows 10
    In Windows Explorer, I right-clicked on C: and went to Properties and then selected the Security tab and edited the permissions to Allow Full control and it ran for a long, long time. When I re-booted the computer it works fine until after the Sign In screen then the screen goes black. I have a cursor and if I hit Ctrl-Atl-Delete I can select Task Manager but then the screen goes black again. I can boot into Safe Mode with Networking and I can get a Command Prompt in Safe Mode. I have looked at ICACLS but I'm not sure how to use it to re-set the permissions back to normal Windows 10 settings.
    Anybody have any ideas?
      My System SpecsSystem Spec

  2.    12 Nov 2015 #2
    Join Date : Jul 2014
    San Jose, California
    Posts : 1,870
    Ubuntu14.04x64 MintMate17x64 Win10Prox64

    I have looked at ICACLS but I'm not sure how to use it to re-set the permissions back to normal Windows 10 settings.
    In order to use ICACLS to restore the permissions. You'd have to run it to save all the permission settings to a file before you change the permissions. I gues you are stuck.

    Try to do a system restore before you made the change to see if it helps.
      My System SpecsSystem Spec

  3.    12 Nov 2015 #3
    Join Date : Nov 2015
    Posts : 3
    windows 10

    I tried system restore, no luck. I can run "takeown" from a command prompt in Safe Mode but can I use that to reset permissions back to default, whatever the default was?
      My System SpecsSystem Spec

  4.    12 Nov 2015 #4

    One does not simply mess around with the permissions settings of C:\ Drive. You have put your system willingly at risk.

    If system restore is not working, try to repair the system or do a C:\ Drive format and install windows back in.
    You wont lose data on the other partitions this way. But take a back up always just in case if any thing goes wrong.
      My System SpecsSystem Spec

  5.    13 Nov 2015 #5
    Join Date : Nov 2015
    Posts : 3
    windows 10

    I gave up and reformatted the hard drive and installed Windows 7
      My System SpecsSystem Spec


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