Hi Proxzimus,
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Are you the administrator of the computer?
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Which software product are you referring to?
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Have you made any changes on the computer prior to the issue?
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Is the issue confined while installing specific software or program?
Follow the suggestions listed below for a possible fix:
Method 1: If you have not logged in as administrator then you may login as administrator and check if the issue still persists.
Method 2: If the above method does not help then you may run the fixit from the mentioned link and check.
Diagnose and fix program installing and uninstalling problems automatically
http://support.microsoft.com/mats/Program_Install_and_Uninstall
Let us know if you need further assistance.