I just got Crysis 2 and before I launched it I downloaded the Hi Res Pack and DX11. So I went to the setting to activate them and noticed it was set to x768. So, I changed it to 1080 and now when I launch the game It launches in a small window and when I go into the settings to fix it I click fullscreen but it won't let me choose a resolution now. Has anyone else had this problem or have suggestions on fixing it?

I have now determined it is actually when I enable DX11 not when I put it into 1080p. My system does support DX11 so what are my options?

Sorry, found another thread on this. I am running a release preview of Win8 and that's the problem.