Well, I have 4 Gigs of RAM and a Nvidea Geforce 8800GTS... was playing on lowest graphics last few days... seemed ok... it could even run on highest graphics with lag...
Then this happened [I could barely navigate due to if being so %@%!ed up.... but luckily I got a pic of it]...
Lol yea... it got worse as I closed Crysis:WH.... I even logged off and back in to my windows account, same thing. I hard shut it down and kept it off for 5-10 mins and came back in and it was fine.