I only have two USB ports and they are both being used up by my modem and my keyboard, so I can't take any of them out. The speakers that I have, have a USB connection and a regular little plug that I can plug into the back of the computer. The problem is that I can't plug the USB connection anywhere because the two slots that I had are already being used up. Before I moved, I had my speakers working at my old house with the same computer, but I forgot how I did it. Can someone help me out?