Admin10 and User10 'Access denied' after withdrawing Win7 user rights


  1. win10trial
    Posts : 20
    Win10-1809 Pro X64 / Win7 Pro SP1 X64 / Dual boot
       New #1

    Admin10 and User10 'Access denied' after withdrawing Win7 user rights


    Hi guys, recently installed Windows 10 Pro 1809 on a second internal drive.
    All was well until I made a stupid mistake in Windows 7 that effects rights in Windows 10.

    PC:
    Win7 Pro SP1 x64 [Legacy] on 1st drive, two accounts: Admin7 and User7.
    Win10 Pro x64 [UEFI] on 2nd drive, two accounts: Admin10 and User10.

    What happened:
    After I installed Win10 on the second drive, I was surprised and annoyed to see that User7 was not only able to access the Win10 partition in Explorer (after reboot and log on ), but also to change and delete things on that partition. So I denied User7 all access rights for the Win10 partition.
    Since then I not only get application startup errors in Win10, but both Admin10 and User10 are getting "Access denied" when trying to view the C: Win10 partition!
    I tried to undo the steps in Win7, but can't change the Win10 partition rights anymore. (Access denied)
    Ran sfc /scannow, which repaired things. Not sure what; CBS.log attached. That didn't solve the problem either.

    My bad of course. I shouldn't have dabbled with things I don't really know enough about....

    So all help and suggestions are very welcome!
    Last edited by win10trial; 04 Feb 2019 at 17:25.
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  3. win10trial
    Posts : 20
    Win10-1809 Pro X64 / Win7 Pro SP1 X64 / Dual boot
    Thread Starter
       New #2

    I tried again and found that ALL Admin10 rights are gone! I can't change anything anymore in Win10.
    But it's 1 A.M. local time, so I have to go to sleep unfortunately. I will log in again at 10 AM.

    Again: all help greatly appreciated.
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  4. Samuria
    Posts : 8,114
    windows 10
       New #3

    If you only denied a single user it shouldnt have a big effect but if you have changed everyone then even admin are in admin.
    Post a screen shot from c: showing permissions so we can see admin should have full rights
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  6. win10trial
    Posts : 20
    Win10-1809 Pro X64 / Win7 Pro SP1 X64 / Dual boot
    Thread Starter
       New #4

    It shouldn't but it did. I can't make a screenshot from within Win10 because ALL rights and therefore even basic functions are denied, like starting Explorer f.i.

    P.S. All Win10 and Win7 accounts are local accounts.
    Last edited by win10trial; 05 Feb 2019 at 05:00.
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  7. win10trial
    Posts : 20
    Win10-1809 Pro X64 / Win7 Pro SP1 X64 / Dual boot
    Thread Starter
       New #5

    I will now try to repair Win10, but don't know if that's possible with a usb.iso....
    so I will be logged off from tenforums for a while.
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  8. win10trial
    Posts : 20
    Win10-1809 Pro X64 / Win7 Pro SP1 X64 / Dual boot
    Thread Starter
       New #6

    Repair was not possible, so I decided to install Win10 again.

    This thread can be closed.
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