Not sure if this information will help with your problem, but, plz redicted to where this info applies.
I recently started having problems accessing my USB storage devices. ALL USB storage devices were saying 'function drivers not specified', while other USB devices worked as normal. ie. printer After extensive 'stab in the dark' operations, I determined the following:
The only way I was able to access these devices, and get around the problemm was to disable "SiS 7002 USB 2.0 Enhanced Host Controller" After disabling, I reset my modem (as this caused conflicts in that area).
After clearing all cookies, etc, shutdown, reinit modem, and reboot, I was able to now operate as before. NO USB devices showed errors, or lacking drivers. Windows needed NO updates, and everything worked well.
/so.... currently
BTW win2000pro here
Multiple external USB mass storage devices (all work great again)
A problem that started just about the time the latest windows security update, is somewhat resolved.
Hope this info may lead to the resolution of your problem.