OK, I'm building a new rig in June. It's going to be my main computer. I want it for watching HD videos from leeched from Newsgroups and for occasional gaming. I can pretty much pick out the hardware myself, but what should I do about the OS? Should I go with Vista or XP? I have a legal copy of XP Home on this computer. But unfortunately, the disc that I have is one of those manufacturer "use this to wipe your computer" discs. So, I probably will need a new OS disc. Is 32 bit OK? Should I opt for 64 bit? Should I go with an Academic upgrade of Home Premium and then use this method to install it, or should I look for OEM? edit: I edited out the fact that my friend wants me just to take his copy of "Microsoft.Windows.Vista.Ultimate.x64.Integrated.February.2008.OEM.DVD9-BIE" to prevent people who didn't read the thread from posting that I'm looking for pirated software. On the contrary, if you read the posts, you'll see that I'm looking for somewhere to BUY this.