I have recently purchased Call of Duty Total War and Call of Duty 4 by down loading on-line. I have a Acer computer using a Net Gear for a router. I'm not very knowledgeable with computers. I can not get into on-line play due to Punk Buster. I have down loaded it although I continue to get thrown off. Is it due to the router Net Gear? The code comes up;pnkbstrA.exe Also when playing Call of Duty 4-solo; when I reach the "One shot one kill" level I can't aim or fire the sniper rifle. it says forward or backwards. I've tried the mouse BUT IT DOES NOTHING.