Control Panel, then system, then hardware, then device manager will bring up a menu listing usbs on my pc. Right clicking on the usb brings up the options of disable and troubleshoot among others. I didn't go any farther from there and I don't know if your pc will be the same. Control Panel is listed on my start menu by the way.
I'm sure you already have but I'll remind you anyway. Try a reboot or two to solve a problem first. I deal with this kind of thing at work ocassionally with pc/plcs and 75% of the time a reboot or two fixes the problem. PC's are the only product in the world we would put up with so many problems on. Can you imagine a car or bike which would sometimes stop for no reason and require you to shut it off, get out and walk around it once then restart?
