1. Our Vista forum has lots of discussions about moving to XP.
2. Often you have to call the maker. Read this -> http://forums.cnet.com/5208-7587_102-0.html?forumID=69&threadID=271360&messageID=2699006#2699006
Notice that installing XP is far from trivial plus you must have the XP SP2 CD or often it will fail.
I recently bought a Gateway GT5654 Desktop Computer from Circuit City. It came preloaded with Vista on it, and I gave it a try for a week, and I hate it. I tried to go back to Windows Xp, but I am having a SERIOUS issue with getting anything to work. It is all onboard, and the only thing I managed to get working was the video, using the Nvidia drivers from the website. Does anyone have a good suggestion as to where I could find Xp drivers, or is all hope lost and I am stuck with Vista?