How to fix your Vista PC if you lost your USB ports after installing that LibUSB thing (only if you have no mouse or keyboard): Shut down the computer using any method that works. Restart. Boot into Startup Repair. One way to do this is when the green bars start scrolling with the "Microsoft Corporation" text underneath, wait 2 seconds, and then unplug your machine. Reboot, and you should be asked to boot into Startup Repair. Boot into Startup Repair. When asked if you want to restore to an earlier date, click "Restore." Wait. You compy should reboot and hopefully your mouse/keyboard/USB ports should be back. Happy Fixing!! I claim no responsibility for lost settings/files/data or damage as a result of use of this method. (Just in case).