Interesting! So that's a conflict caveat, then.
I recall that an explicit drive letter mapping (i.e., from a cmd window,
"net use t: \\computername\sharename") holds, in XP, only for the user that
installed said mapping. IOW, if I log on at that same computer as a
different user, the mapping will NOT be present unless I perform the same
explicit mapping again, while logged on as that second user.
This implies that the low-ranking user might have employed such a mapping,
while the adminstrator did not.
Thus the low-ranking user runs into conflict, while the administrator does