[JohnH]

I am a bit late on this but assuming you are running XP then try removing sall the installed USB devices in device manager - the issue is - you cannot do this normally you have to use the show hidden devices option and this requires an environment variable set up:

1. Click Start, point to All Programs, point to Accessories, and then click Command Prompt.
2. At a command prompt, type the following command , and then press ENTER: set devmgr_show_nonpresent_devices=1
3. Type the following command a command prompt, and then press ENTER: start devmgmt.msc
4. Troubleshoot the devices and drivers in Device Manager.
   
   NOTE: Click Show hidden devices on the View menu in Device Manager before you can see devices that are not connected to the computer.
5. When you finish troubleshooting, close Device Manager.
6. Type exit at the command prompt.