Which game(s) did you try? I need to know this to help trouble shooting.
This crash should only affect 64bit executables. Support for 64bit games is still a bit experimental.
This shouldn’t be a problem though, almost all games also have 32bit .EXEs, so one general thing you should try is using the 32bit version of the game. If you don’t know how to do this for a specific game, please let me know.
Another thing to try is temporarily disabling your virus scanner, and see whther that helps.
Also please take a look at the general trouble shooting guide above.