I recently formatted my computer because of a virus problem that was a little insane. I re-installed windows all correctly, got all the service packs and stuff like that. The problem is that my speakers aren't working. They are plugged in but my computer is not recognizing them. They are the Logitech LS21 2 1 Stereo Speaker System. Any ideas on why my speakers wouldn't be being found? (Also my computer can't display colors using red pixels, but thats a different problem.)