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#21
If it's within a year you probably also have full warranty and tech support from manufacturer. I don't know whether Best Buy's protection overrides that but I doubt it. Call to see.
They have a loophole where they can say they don't support Win7 install so just monitor closely what they do to get Vista installed (maybe pulling a memory stick - that's the first step I'd take with it) so you can do the same with your Win7 install. If you use Tech Support tell them you're reinstalling Vista if they tell you they won't support 7 install, then install 7 instead.
I know it's frustrating but it's important to keep positive with them. When I've had to deal with them I call to ask when they're not too busy so I can come by, then they have given me help right away testing a power supply once with 2 or 3 geeks poking in the case to give their opinions. I noticed they had SevenForums open on a monitor.