1) Crysis2Launcher.exe for update
2) search google for custom graph program it may help too with that you can pass the demos at the start
3)reinstall if non above works
I don't undestand your number 2. However, I did both number 1 and 3, and still doesn't work. By the way, it happened again during I ran the 3DMark Vantage right before the Physics and Burn test.