Vista - Connected to a folder that does not exist

Whenever I logoff or reboot my computer the Foldershare share in
“C:\Users\Scott\Documents� (Documents) on my Vista Ultimate computers gets
disconnected. This happens on all the shared computers. When I log back on
I get the message “My_Documents was connected to a folder that does not exit
(C:\Users\Scott\Documents). I have several other shares such as Music,
Pictures, Videos, Downloads, etc. that do not get disconnected. Why is
Documents getting disconnected and I have to add the computer back to the
library every time I log off or reboot? Why isn’t this happening with the
other shares?

Thank you.