When I bought my computer about a year and a half ago or so, it came with XP... but said it was compatible with Vista. So far, I've been pretty happy with XP...but I was wondering, would it be possible to download Vista from a torrent site, burn it on to a DVD, and then upgrade to Vista? What are the drawbacks and highlights of Vista anyway? I know it comes with a 64bit setting...right? What exactly does that do? Also, if I did somehow upgrade to Vista, what would I lose? In terms of files, folders, programs, etc.