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Do you have the latest driver for your Video card installed?
Have you tried completely wipping the game from your system and reinstalling?
 
The first time it stopped working before you reinstalled, was it the same exact problem?
What changed in your system just before that? This is a program it does not just decide to work differently then everytime before, something had to have changed that caused the new behaviour, that is what we need to track down.

Also if you leave it running for say 20min, does it eventually run?
 
Try waiting 20 min as I suggested, that will tell me some things.
 
Try hitting alt-Tab when the game is running like that.
 
Strange that it loaded for you once though?