Call of duty mw2 Help

Hello Guys,Why does the Game lag for me? I meet the Requirments,I got Fast Internet Connection so I how do I fix the lag.

run a virus scan...

close programs you dont need...

use tuneup utilities..

Ok,I'm installing Tuneup Utilities.

http://www.mpgh.net/forum/197-combat...stem-care.html

I use this. And also, remember meeting the requirements doesn't mean you can play it without lag. Try settings it low. Specs of your PC?