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


  1. RCinMSP
    Posts : 3
    windows 10
       New #1

    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?
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  3. topgundcp
    Posts : 2,799
    Linux Mint 20.1 Win10Prox64
       New #2

    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.
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  4. RCinMSP
    Posts : 3
    windows 10
    Thread Starter
       New #3

    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?
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  6. Shadow Delta
    Posts : 126
    Windows 10 x86 Professional
       New #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.
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  7. RCinMSP
    Posts : 3
    windows 10
    Thread Starter
       New #5

    I gave up and reformatted the hard drive and installed Windows 7
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