As many in the community have previously read, I installed a new graphic card.  
I upgraded my OS from Windows Vista to Windows 7.
I have a 700W power supply but is 5 years old.
I run the game as administrator.
All of my drivers are up to date.
***My computer freezes after a while of game play (anywhere from 1 to 3 hours) forcing me to reboot the computer as it becomes unresponsive.  No idea why.
1.  How can I trouble shoot this issue?
2.  My first instinct is to uninstall the game and reinstall it.  
3.  I just turned off the Windows auto update.
4.  My firewall is deactivated
5.  Is there anything I can do to turn off processes running in the background?  I know how to, but I don't know WHAT to shut down and leave running.  Is there a place I can go online that outlines junk processes that aren't necessary?
What other causes could cause the freeze?
Thanks! 

SlipKnoT