I recently built a computer for my younger brother, and put the upgrade version of WIndows 98 on it. Now, he's having all sorts of errors when playing games. ALmost any game has a 50% chance of freezing the computer on load. This and other bugs, I'm thinking may be a result of the upgrade version of WIndows 98. We recently purchased the full version, and I was wondering, what's the EASIEST way to switch over? Do I have to Uninstall Win98? If so How? Do I have to format the C Drive? Or do I just run the setup program on the full version of Win98, and expect it to upgrade by itself?