I purchased a retail copy of Crysis 2. The first time I installed the game and tried to run it, my anti-virus ( AVG 2011) spotted a virus. I figured it was a false-positive and continued but the game would not run after the install. I decided to uninstall Crysis and turn of my anti-virus and reinstall. I was able to run the game and played for a couple of hours.
Later I tried to run Crysis 2 again and the same problem had occurred, disabling AVG did not fix the problem, uninstalling AVG completely did not solve the problem. I'm not sure what the problem is but I don't feel like wasting my time constantly reinstalling Crysis 2.
My specs are
-ATI 6850
-AMD phenom X4 955
-4gb of ram