you need at least a p4 3ghz (preferably a decent core 2 or athlon x2) with at least a gig of ram to run on, and you need at least a basic video card with at least 256mb of ram for aero to run on. preferably you'd get at least a 2.6ghz dual-core processor, 2gb of ram, and a standard graphics card with at least 512mb to run smoothly on.