Hi Mike,
This was previously posted by Rick Rogers MS-MVP.
Start/run regedit
Click edit/find
Search for A:\
It will most likely turn up in a key containing MRU (for Most Recently
Used).
Highlight the string in the right pane by left clicking it, click
registry/export and save it to a location you can find later if
necessary.
Then delete that string, and agree to the warning.
If there are problems resulting from the deletion, you can simply
double-click the exported copy to return things to the way they were. If
all
goes well, then you can simply delete the exported copy at a later date.
Close the registry editor, you may need to reboot, but the effect should
be
immediate.