hey there.. i dont have any virus warnings but onto the demo:
as standstill it looks ok, but when anything is moving, be it the camera or the soldiers, there is a very noticeable lag for the ssao creating heavy artifacts over here. i am using geforce 6800

the f11 panel gives me between 60 and 140 fps, but it feels like 5 fps due to the mentioned lags.

hope this helps you improve it