Hi, I'm going to be upgrading my 1.5 year old desktop to windows vista ultimate when I go home for thanksgiving from college. I am just planing to clean install and start fresh. I have 1.5GB's of ram and a 3.2 Ghz Intel P4 processor. The windows tool to see if everything is compatible found no problems. My question is how difficult is this upgrade going to be? Will I have to download a bunch of new drivers for my hardware or should most things run like they are supposed to?