Help - can't play GWX - SH3 causes reboot :(

[panthercules]

Crap - got back from a trip and discovered that GWX was out

However, tried to play GWX and got nothing but failure - every time I try to start SH3 it gets to the copy protection screen and then causes my PC to reboot (and yes, I am using a legit DVD to install and play)

After some methodical troubleshooting, I have concluded that apparently it's not GWX's fault though - I get this same behavior as soon as I do my clean install from the DVD (and after I patch it to 1.4b), before I even try to install GWX or SH3 Commander. This is a brand new PC, and was running my prior GW 1.0x install just fine a few days ago before I renamed/moved that install aside so I could do a fresh one for GWX. Everything about the SH3 install and patching process seems to work fine, so this reboot/failure has me baffled.

Anybody got any idea what's causing this or how to fix it?

I'm dying to try GWX out - can't believe this rebooting thing has started