Problemen: In the explorer are listed mapped drives, but the should be removed. Disconnecting is not working.
In windows XP i edit the registry, to remove the broken drives. Go to
HCU>Software>Microsoft>Windows>CurrentVersion>Explorer>Mountpoints2
The mapped drives starts with ##, delete the broken drives. Now restart to see the effect, maybe logout and back in is also working but i did not test that.
HTH