I am sorry if this is the wrong place to post this but I need an answer. I need to do a clean OS install and I was thinking about switchibng back to XP pro until windows 7 come sout and has the bugs worke dout. I currently have vista ultimate 64 bit and 8 gigs of ram. I want to buy XP pro 64 bit but it seems to only come with sp2 installed. I was wondering if after installing this I can installl sp3 on 64 bit XP pro? If i could get 64 bit XP pro sp3 I would be a happy camper.