Error at running game

[helljumper]

hey guys..my friend bought the game last night from steam..it worked for 2 hrs and now he is getting this error...


Main executable has stopped working, a problem caused the program to stop working correctly.
windows will close the program and notify you if a solution is available


Any idea what to do??? cause he has tried all possible things that we can come up with..

e.g. Reinstall the game, update drivers..still no luck