(you didn't specify what OS so if you're using windows 7 try this first) Bring up the start menu, click on Computer, right click whichever drive windows is installed on, go to properties, click the tools tab, and under "Error-checking" click "Check now..."
Yes I do have windows 7 64bit sorry
Have you been playing these games and using the PC successfully for a long period of time and the blue screens only recently started happening? Another thing you can do is check application & system logs in event viewer, look for any events occurring around the exact time of day that a blue screen occurred