Okay, I have read all the posts concerning which windows os is best. If I want to set up the ultimate 64 bit windows os, which one do I need. I can get my hands on a XP Pro 64 bit package without putting out the moola! But will that work? My son would like to play some of his PC games on this machine. I am not a big fan of gaming but would occasionally play one if available. That is all I would need windows for. Man, I can't believe I am still addressing windows stuff. This is why I jumped to Mac to get away from this.