Try these steps to see if this helps (you will probably need to plug in a PS/2 keyboard and mouse to do this as deleting the USB devices might make your mouse/keyboard unoperational):
1. Restart the computer and press the F8 key repeatedly after the first screen displays. A Startup screen displays.
2. Select Safe Mode and press Enter. Windows starts with Safe Mode displayed in all four corners of the desktop.
3. Right-click My Computer then click Properties. Click on the [Hardware] tab the top then choose "Device Manager".
4. Click the ( +) plus sign next to the
Universal Serial Bus.
5. Select
USB Root Hub, and then click
Remove. Continue until all USB Root Hubs are removed.
6. Close Device Manager.
7. In Windows 98 and Me, click Start, click Find, and click Files or Folders. In Windows XP, click Start, click Search, and then click all Files and Folders.
8. Set the Look in box to Local Hard (C: and D
.
9. In the Named box type
usb.inf, then click Find Now.
10. Right-click USB.inf, then
Install.
11. Restart the computer and verify that the USB Root HUB exists in Device Manager.
12. Go to C:\Program Files\MP3 Player Utilities 3.68\RDiskUpdate\driver (or whatever folder you have the MP3 Player Utilities installed).
13. Right mouse click on
AdfuUpdate.inf then choose "Install".
14. Reconnect the USB device.
Try that and let me know if that works or not for you.