I bought a laptop SZ650N Sony wich comes preloaded with vista from the factory and it doesnt come with a vista CD just the vista CD key. Well i thought id give it a shot and downgrade to XP pro, but there is about 20 different things i gotta download to make XP fully functional on this laptop, so i got tired of that idea and now am thinking about going back to vista but there is no reason for me to buy vista since i already have legally bought it with the laptop. does sony offer this on their site if you provide serial number of the laptop or anything?