I have windows vista. everything works great, for drivers for my nVidia 7900 GS graphics card off Windows Update
Only thing that dont work is my new Epson DX5000 All-In-One
Also with all the intensive graphics, the computer loads quicker, boots up quicker, programs load quicker, its amazing
EDIT: look here http://www.pcpitstop.com/techexpress.asp?id=SL6JFW7QYCWS4WMJ