I bought a second computer so my wife could play. The old computer has a Radeon 1925 128mb vid card, 1gig ram and a 2.8gh processor and a fiberoptic connection. The new computer has a GeForce 6150 128mb vid card,1 gig ram, 2.4gh processor and a fiberoptic connection. The old computer has no lag at all ever the new computer has lag as well as being a bit jumpy at all times. The only real difference between the 2 machines is the old one has Windows xp and the new one Vista. Could it be Vista and if so what do I need to do to resolve the problem?