Not being an XP user (until RC1 ships), I may be p***ing in the wind, but in Win2k there is an option (Control Panel->System->Advanced->Startup & Recovery) to turn off the automatic reboot so that you can see the information that the BSOD gives you.
If that option is there in XP, try turning it off and see what the error message is.
The 4-in-1 drivers are notoriously buggy - so you may want to install a lower version of the drivers. Also, despite the fact that VIA say their drivers are XP compatible, given the past history of their drivers, I wouldn't be overly surprised if there wasn't any XP functionality in there at all!
Rgds
AndyF