I was just messing around with this Unknown Device with no manufacturer or hardware information listed for it that I have had since day 1 and couldn't figure out what it was. I found a website that allowed for a trial scan of my compute for driver updates. It determined that it was for an iMON USB device from Sound Graphics. I don't have anything like that on my system. I installed the driver, which Vista somehow had related to my PPC6700 phone docking station (which was already syncing correctly so I have no idea what it did). My graphic card peformance suddenly went from 2.1 to 2.4. Huh? This is a driver not graphic peformance related in any way. For whatever reason, now I sit at 2.4 because the performance is based on your lowest score. The totals: CPU:5.2,RAM:5.9,Graphics:4.6,Gaming:2.4,HDisk:5.6. Yeah, this perf rating thingy is a crock.
Do you have a Sound Blaster sound card? If so, it is probably related to that, it is a driver issue.