Just had to reboot for Safari 3.2.1 so ducked into Vista to check for you. I've got my iSight listed under the "Imaging Devices" objects in the Device Manager. The driver provider is listed as Microsoft and the files its using are
version is 6.0.6001.18000 (longhorn_rtm.080118-1840) for each of them.
I'm not 100% sure I think after downloading and installing the driver I linked to above I then had to install the BootCamp 2.1 Update driver set so perhaps you need that too? Sorry for my foggy memory its been a while since I had to jump through all these hoops.