I've had this problem for awhile now and I have been lagging from about 80 FPS to 20 (or even less) when I hear this noise that sounds like a program is opening/closing. I don't have any viruses, it's happened ever since I started playing this game. It was the first thing I've downloaded/installed after I hooked up my new computer. The noise Vista makes even continues often even when I minimize my game client. Any help?