I just went through a similar problem only much worse. I wanted to update my video drivers (ATI9800) after installing SH3. I went to the ATI website and they recommended downloading their Catalyst Control Center, along with the drivers, and to use the CCC I also had to download Microsoft .NET Framework version 2.0.
When I installed the Microsoft crap my computer rebooted and then went into an endless loop of rebooting. Couldn't do a system restore even from the Safe Mode.
Had to do a total reformat and lost EVERYTHING on my comp
I wouldn't blame SH3 for your problems. There are so many variables when installing these complex new programs that each one is a major gamble. BTW...I downloaded ONLY the Radeon drivers after the reformat and everything is working fine. Don't you just love it when companies give you bad advice on upgrading THEIR software?
Dep