What comes to my mind are:
- Motherboard drivers (I couldn't tell from your post wether you've updated them)
- Insufficient power from the powersupply
- Overheating
While I've never had an ATI vga card, I've had troubles with all of the above before. Although I don't think I've ever had video problems after the game in question crashed (unless the videocard driver crashed, which results in message by windows telling you to restart).
Try to rule out any of the above, each of them can cause weird behavior.
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