I have Windows ultimate vista. Im using 2gb ram and a video card of 512mb (nvdia GeForce series 8) Its really cool and the features are so cool too. Plus the wallpaper lolz. Theres only one problem with this OS you can only activate this OS for one time once you did it. Youre all mess up cause if you decided to change hardwares, it wont work FYI Windows Vista Ultimate is one time activation only once activated, it scans your computer.