Microsoft should have keelhauled the idiot who came up with UAC, it complicates the hell out of tech support.
Is this YOUR computer you're doing this on? If it's someone else's computer go get your own, if it's YOUR computer then Microsoft has no right to control how you use it. Run As Administrator, disable UAC, if you're going to make modifications to a game you can't have the operating system denying permission to make modifications.