Just to contradict everything everyone's said so far about Vista - I actually quite like it! Get rid of the "gadgets" and it runs better, then it's just a few quirks like having to right-click on some programs and set them to "run as administrator" (even when you ARE an administrator). Other than that I've had no problems so far. This is coming from someone who has grown up using DOS and Windows and uses Windows PCs and Macs at work! And in case you're worrying - once you've set the launcher and the program to both "run as administrator" WoW works really nicely on it!