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Registry Key Permissions Missing

I have a Windows XP SP2 computer that is having trouble reinstalling quicktime, it gives a permissions error during the process.  I've traced the problem to several registry keys.  The user is an administrator on the computer, but they can't view/modify/delete several keys related to quicktime.  I can't even open the permissions on those keys.  How can I modify the permissions on the keys or delete the keys?
System UtilitiesWindows XP

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younghv
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You can't 'right-click' on the key and go through the 'Take Ownership' process?
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sirbounty
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willcomp
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Various malware programs (some smitfraud variants in particular) will "lock" registry keys (access denied).  I recommend you first run a scan with SuperAntiSpyware -- link below.

http://www.superantispyware.com/?tag=GOOGLE-SUPERANTISPYWARE

I've had to go up the Registry Key tree to section root and reset all child permissions (e.g HKEY_Local_Machine) to allow access in some cases.  If problem is a smitfraud infection, SmitFraudFix usually takes care of Registry permissions for you.

http://siri.geekstogo.com/SmitfraudFix.php
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orangutang

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Thanks for the help, I haven't used subinacl except for NTFS permissions but it did the trick.  I split the points, sirbounty got the right answer but orangutang's article shows how to make the changes very simply.
Windows XP
Windows XP

Microsoft Windows XP is the sixth release of the NT series of operating systems, and was the first to be marketed in a variety of editions: XP Home and XP Professional, designed for business and power users. The advanced features in XP Professional are generally disabled in Home Edition, but are there and can be activated. There were two 64-bit editions, an embedded edition and a tablet edition.

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