For all who have problems, if the computer continually reboots as sounds is the case with USA driver, reinstalling the operating system should solve the problem; maybe even a system restore.
If you are PC literate and know how to install harsware yoursself, I upgraded my PC with a new M/B, 2GB RAM, 2.0GB intel dual core, and NVIDIA 8600 GT 512 MB graphics for less than $200 ordering from Tigerdirect.com. You might alswo need a new case, but everything else HD,CD ROM, etc can be used.
You might think that a dual core CPU will slow you down, but believe me, my frame rate is above 50