Look here for Device mgr error codes. Sometimes helpful, sometimes cryptic.

http://support.microsoft.com/support/kb/articles/q125/1/74.asp?LN=EN-
US&SD=gn&FR=0

(cut and paste if needed)

On Sun, 29 Oct 2000 15:38:40 -0700, Robert Humble wrote:

>Yesterday I was sprucing up this Dell PII 333mhz, 128mb, 8 & 20 gig hard
>drives, Windows ME, uninstalling some programs, installing some, and using
>Partition Magic 6.0 to merge some partitions.
>
>After merging and uninstalling and immediately after installing Delorme
>Eartha software and rebooting I found the mouse had quit working.  It's a
>wireless Logitech Wheelmouse and was on a USB port.  I moved it to PS2,
>using adapter, and it worked correctly.  My camera which connects only to
>the USB port is not now recognized as a removable drive.
>
>Device Manager shows the dreaded yellow diamond with exclamation point in
>front of the USB driver.  Driver is named "Intel 82371AB/EB PCI to USB
>Universal Host Controller".  Reinstalling the driver, removing it and
>refreshing does not correct the problem.  There is no USB Root Hub shown,
>and I don't remember if there ever was.
>
>Device Status says "The NKTERN.VXD device loader(s) could not load the
>device driver".  (Code 2).  System Resources shows the driver as a Problem
>Device with an Error Code 2.   Wonder what Error Code 2 means.  If I knew
>that I might know what's wrong.
>
>Changing driver to Standard Universal USB to PCI Host Controller does not
>help; it still shows up as broken.  Windows does not recommend installing a
>Generic Driver, so I have not done so.
>
>I'll sure be grateful for anyone's thoughts on this problem
>

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