Please open your debug.err file in notepad, and link the contents into a post here via pastebin. This will give us some technical information that can help troubleshoot your problem.

The file can be found in My Documents\My Games\Elemental

Be sure to copy the debug immediately after the error occurs; if you start the game again, the debug log will be erased and recreated for the new session.

Are you sure? There should always be a debug.err file--the game writes it continuously from the time you start it. Even if it doesn't appear to show anything useful, the technical details may offer some clue.

A bit off topic but a game crashing error nonetheless: My game is constantly crashing due to a "memory allocation bug". I hope this help you guys out. 

http://pastebin.ca/1924823

Here is a simple tip on overheating some people miss - if you computer case is on carpet you can lose all the air flow from under your case.  put it on a board etc and it keeps the case much more cool.  Other than that - have you checked your case fans to see if they are working?  Also the graphics card fans - but that is much less likely.  I'm running on the same model card with no problem.  Vista though not xp.