For some reason, randomly, my computers peripherals, as in the mouse and keyboard just stop working. The computer itself is fine, videos keep running, games keep running, etc, but the mouse and keyboard don't work, despite their LED's still being lit. This is a new problem, I haven't downloaded anything from the time this started, the only thing that has changed is that I've gotten a USB network adapter, but, in the beginning, that changed nothing. I've tried unplugging and plugging in the USB's, to no avail, and I've ran many virus checks, with nothing coming up. Any thoughts?