My computer has been freezing while dual boxing. Here are my specs:

NVIDIA GeForce 7600 GT
3 GB RAM
AMD Athlon 64 X2 Dual Core Processor 3800+, MMX, 3D Now (2 CPUS)
Windows XP Professional
DirectX 9.0c
If you need to know anything else, just let me know.

I am running ALL old school graphics, and that hasn't fixed the problem. I have begun to wonder if it's a heating problem. When I custom built the computer, I didn't install a new fan or power supply because both had problems when they arrived. Any help from the community would be great. The freezes seem to be random. Sometimes I will just be running around in an empty zone and it will freeze, and other times the comp will freeze in the heat of combat. I don't have any other games/applications running while playing EQ. I recently cleaned the dust out from my computer and that didn't solve the problem. Well, thats about all I can think to say. Thanks in advance for the help.