Most desktops do. If so, and you may need to obtain a keyboard and mouse with PS2 plugs, but it should allow you to use a mouse and keyboard to set things right. Unplug the USB devices, plug in the PS2 stuff and restart the machine. It's important to note that the computer may not immediately recognize a PS2 keyboard/mouse and a couple of restarts might be needed to allow the computer to accept the new hardware.

Hope this helps.