I have the following situation:

A - An XP Media Sever with movies, pictures, music, etc.  All folders are shared and not network mapped.

B - A Windows 7 Build 7100 32-bit Media Center. It sees all the music, picture, etc., folders on A.

C - A Xbox 360 with all updates applied.  Recorded/Live TV, etc., work fine.

D, E and F - Other XP, Vista and Windows 7 boxes on the network.

C can see media files on all systems except A (The only one I am interested  in).  For that system it says "No shared files" when you try to expand the "A."  Yes, it does see that it is there.  It does not even expand to show the various drives and directories like it does for every other system.   If you enter the \\A\My Music it does not give an error message and it shows up in the folders, but only 3 sample music folders on B is there when you go to Music, etc.  This is true for videos, pictures also.

This same A server has been being used for years with the same Xbox and Vista running on B.

I can make shared drives, put them in the Xbox account in a .bat file on the Media Center, etc., but it seems like the solution to the problem is simple if I could just figure out why "A" does not look-like any other Windows systems in the WORKGROUP.