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I am trying to completely remove McAfee from my Acer Aspire netbook. I downloaded MCPR.exe, and run it as an admin, in safe mode, but it fails to remove some registry keys. When I try to edit permissions for those keys, i get "permission denied", even though I am an admin, and run regedit as an admin. How should I remove those keys?

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If you check the permissions of the key(s) in question, and particularly the owner of same, you may find that you need to first take ownership to change the permissions. –  BillP3rd Sep 7 '10 at 0:57
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2 Answers 2

up vote 4 down vote accepted

Right click on the Key in Question and select Permissions

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Then click the advanced Button

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Then click the Owner Tab, highlight your Admin account in the "Change Owner To" window, then tick the "Replace Owners on sub containers and objects" box and hit OK on all the open windows. closing all permissions windows.

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Re open permissions on the same key and tick Full Control in the Allow column, hit OK

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You should be able to delete the key now.

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Thanks a lot, this did it! –  AlexKuznetsov Sep 12 '10 at 11:55
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Registry keys have ACLs that dictate permissions just like files and folders in the file system. Being Administrator does not give you implicit permission to modify or delete keys - you must either use an account that has been granted these rights or change the permissions accordingly.

You may find that the owner of the McAfee keys is SYSTEM. Try to have the Administrator account take ownership of the key and then allow Full Control.

NB: Take care when making modifications to the registry and be sure about the purpose of the change. Always make a backup - it's better to take the time to have a recovery option.

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Ajw, how can I "have the Administrator account take ownership of the key" in Windows 7? –  AlexKuznetsov Sep 7 '10 at 1:23
    
It's concerning that you have to ask but: right-click on key, Permissions, Advanced, Owner Tab, Change owner to: Administrators, Check Replace owner on subcontainers and objects, Apply, OK. –  Ajw Sep 7 '10 at 2:05
    
Thanks, this was helpful! –  AlexKuznetsov Sep 12 '10 at 11:55
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