My computer wont let me uninstall anything?

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Code:
whenever I go to my uninstall programs list and choose a program to uninstall it says "The system administrator has set policies to prevent this installation" then it says "You do not have sufficient access to uninstall (name of program). Please contact your system administrator" I am an administrator on the comp and it wont let me uninstall anything. Could someone please tell me how to fix this. My comp is a Windows Vista Home Premium 64-bit operating system.