[SOLVED] CrossFire Lagg.?

Ok. I have a big problem. I can't play crossfire because i start it then my mouse lagg my board lagg to. Enter in a game. I want to move i press W or A or D after 1-2-3 sec he move me.. I move my mouse and the game move crosshair after 2-3 sec.... Why?
I try reinstall. I try restart. what to do? can u help me?
I have 40-50 ping. 50-60 Fps. now a week it worked perfectly ....
i reinstall windows ,format c:, d:. Nothing just lagg.

u did downloaded a virus for sure..reinstall ur pc and when u do it delete all partitions and formate again..