What about
http://www.xda-developers.com/
What version of activesync you using?
Actuall have a look at this page.
Need Wizard drivers for XP - MoDaCo
I know with my old Imate Jam I never had to load any USB drivers just active sync.
I remember once having an issue with advanced network connectivity now though.
press start-settings-connections tab.
Usb to PC
Either tick or untick to see if makes any difference.