Everything was working fine with my Win7 computer until a couple of days ago, when my USB mouse stopped working. It seems to be related to two "Unknown device" devices that show up in Device Manager. I've tried deleting them, but they come back, because when I delete them and all the other USB devices (root hub, etc.), things get re-detected after reboot, and the mouse has power and works briefly, until those two devices get detected. after which it stops working.