Okay long story short I built my computer and I purchased an OEM version of windows vista home prem. I Got in on the intel discount for the i7, xso58 mobo, and windows ultimate for 289 and Im obviously going to get rid of my cpu mobo and ram (e8400, asus p5q pro, 4gb ram) and install this new system. Im useing the same hard drive so can i reuse my windows vista home prem and not use the new ultimate im going to get. Id prefer to sell ultimate since to me there's no point in using ultimate over prem. Also what will happen to all my games i have installed on my pc? I have over 20 titles (all purchased instores and some on steam) I have the disks and all cd keys but wont it recognize this is a different computer and it has been activated once already or will they install correctly?