For what it's worth...
I was having a similar problem with my Blackberry's removeable storage. Same problem with the WPD FileSystem Volume Driver.
Here's how I fixed the Blackberry. You can use the same aproach for any USB removeable for Vista or XP.
1. My Computer -> Properties -> Advanced System Settings. This takes you into the system properties like in XP. Go into Environment variables and create a new System varable called devmgr_show_nonpresent_devices (I don't think it's case sensitive). Set this to a value of 1.
2. Go into device manager. From the view menu, choose "show hidden devices". Because of the environment variable, you now see all devices not in use.
3. Uninstall any "Universal Serial Bus controllers" not in use (greyed out). Also I uninstalled any storage volumes, storage volume shadow copies, and disk drives also not in use. You should see your offending USB device in one of these areas.
Now try plugging your device in and see if it now detects. You should be ok now, even after a reboot.
-Paul
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