Start...Run..."mmc".
Add/Remove Snap-in.
Select "Group Policy" on the local computer.
"User Configuration", "Administrative Templates", "Control Panel", "Add/Remove Programs".
That's where the setting gets configured. If the server is the member of a 2K domain, check the Group Policy on the domain or any container objects you're in. If that doesn't help, try the old NT4 poledit program.
hope this helps,
-gbiello