I have a bass amplifed headset that when plugged into all the usb ports work. I have three other usb devices a USB printer, a USB mp3 player, and a USB connectable cell phone. Now none of those work but the headset... on any port. All three devices work when plugged into other computers, with any number of different cords that I've used. I'm running a fresh install of Windows XP home, completely updated.
I've tried the devices on all ports, none work on any, I've tried them on other computers they work fine. So something is missing on my main computer.