You're not alone. I'm glad you posted you message because it confirms that there is something strange going on with W2K and networking (drive mappings). I've been having a problem with not retaining drive mappings only on W2K professional. I have not been able to isolate to a particular senario but if I do and find an answer I will let you know.
Wayne Finch
Life is like a box of ....
C. W. Finch Consulting