City of Heroes And Windows 7

Ever since I installed windows 7, my computer won't run CoH correctly. For a while, I had problem where whenever I started CoH my screen would just flash really fast until I turned the game off. I found a third party driver for my graphics card which solved that problem, but still whenever I log into CoH my whole computer will shut itself off after about 5-15 minutes of running the game even if all I'm doing is just standing around in atlas park.

There are a few important things to note. Firstly, my computer had major problems shortly after I installed windows 7. I had to replace the motherboard, the power supply and the cpu fan. This could be related to these problems.

Secondly, when I turn my computer off I can't really get it to turn back on very well. It tries to check the hard drive each time, but doesn't find anything. Even if it gets through the hard drive check the computer will just turn itself off before it gets all the way into windows 7. If I keep trying to turn the computer on again, it will get severe artifacting on the screen and still not make it to windows 7. If I turn the computer off for about 15 minutes and then try, it can turn all the way on.

Here are some basic specs of my computer:

OS: Windows 7
Processor: Intel Core 2 Quad CPU Q6600 @2.40GHz 2.40GHz
Ram: 4.00 GB
System Type: 64-bit Operating System
Graphics Card: ATI Radeon HD 3800 Series
Extra PCI Cards: AGEIA PhysX 100 Series PCI Card

The graphics card is running third party drivers to be able to not have a flashing screen when CoH runs. My sister's boyfriend tells me that the PhysX card's fan is dying/dead which could be part of the problem too.

Any suggestions would be welcome!

Thanks

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Liberty Server:
Genso - level 50 controller
Tsuya - level 50 controller
Mia Chan - level 50 controller
Tsu One - Level 50 scrapper
Ember Kitten - Level 50 Blaster
Various alts

So as an update, I just installed the newest drivers for my graphics card, ran CoH and disabled particle physics in my options.

When I restarted my computer it was able to get all the way into windows without my waiting 15 minutes. When I ran CoH, it ran for a few minutes before the graphics card shut down from trying to run CoH. I'm going to try the fix someone posted in this topic section to see if I can get it to stop doing that next.

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Liberty Server:
Genso - level 50 controller
Tsuya - level 50 controller
Mia Chan - level 50 controller
Tsu One - Level 50 scrapper
Ember Kitten - Level 50 Blaster
Various alts