access denied to shared folder

Hello there

I have a computer with windows 2003 server installed on it. There is one shared folder. The computer's name is SERVER. The shared folder's name is OFFICE.
Whenever I type \SERVEROFFICE in a windows explorer window, I get a pop up window with a message that says that Windows does not find \SERVEROFFICE.

How can I fix this?
I mean, I should be able to see the folder in this way because this OFFICE folder is shared and I am doing this from the same computer and not from another computer in the LAN.
Any idea?
Thanks