I currently have Windows XP and I am thinking about upgrading to Windows Vista for Directx 10. So I have a few questions on Vista: 1) If I upgrade to Windows Vista can I go back to Windows XP without having to backup my data? 2) Can I use the same serial number for 2 of my computers? (Is it legal?) 3) Are my system specs (as listed below) high enough to have Windows Vista running quickly? Asus P5GC-MX/1333 MOBO EVGA NVIDIA GeForce 8600GT 1GB DDR2 Video Card 1GB DDR2 667 Trancend Ram Intel Core 2 Duo 1.6ghz Processer 450W Power Suply (Sorry I forgot to post them earlier) Thats all I have to ask. Please reply quickly because I only have 2 weeks to decide! Thanks!