The games look good but they don't play out well, sometimes laggy, objects/people disappear after a certain distance, etc. My desktop is very old so what can I replace besides the entire thing so I can actually shoot back at invisible people more than 100 meters away? Video card? Ram? Processor? I'm on vacation so I can't post all my specs but here's what I remember anyway. Windows xp sp3 2 gigs of ram Nvidia geforce 6600 gt I hope that's enough info, sorry if it isn't.