We just migrated one of our sites to Windows 7 and suddenly 2 PCs started having a wierd issue. A USB device suddenly starts connecting and disconnecting non stop with the usual "Ding Dong" sound.
I first thought it was a rogue USB key but I have disconnected all USB devices from the desktop and it is still doing it even with nothing connected. Even started uninstalling the USB drivers one by one and restarting the PC. This is constant at least 3 times a minute.