If someone who does is using XP, they can look up this information in device manager. Go to properties, then to the details tab, and it should look like this: USB\VID_0B05&PID_1715\6&22sF361E&0&4
That's a sample only based on a bluetooth dongle - it is not the actual device ID for the webcam.
From that VID number (in this example 0B05) you can look up the manufacturer.