If what theosgirl45 said doesn't work .. You could try yanking the battery from the motherboard, count 10 seconds, and put it back in. That should restart your bios settings and should fix the problem. It could be that you do have a virus and your protection isn't detecting it. Some viruses are more advanced then the protection can detect. That or they get inside your computer and shield themselves as a required file, which the protection won't recognize. Unless you go in and manually remove it, if you know what you're looking for.
Try a different USB port on your computer for your External. It could be that the USB port that you're using has gone bad or has become disconnected. As well try a thumb drive (also known as a flash drive) or another USB device on the same port that isn't working. To see if it is the port or the External itself. It could be that your External is shot and isn't actually your USB port.
at 12:52 AM on Mar. 30, 2010