samba - Sep 2008 - Bizarre behavior trying to connect to samba share/service from windows XP

I'm using smbd version 3.0.28a on ubuntu 8.04.1
uname -a provides
   Linux bambi 2.6.24-19-generic #1 SMP Wed Jun 18 14:43:41 UTC 2008 
i686 GNU/Linux

The issue I have is that I want to have a service called C as defined as 
follows:

[C]
        path = /share/MD0/C
        browseable = yes
        public = yes
        invalid users         read list = guest, @"everyone"
        read only = yes
        locking = yes
        write list = jb, @"administrators"


Which I can't connect to from a Windows XP Service Pack 2 box.
However I can connect via umount.cifs from another linux system.
I can also connect if I rename the service either C$ or D.

If I try from my windows box I get the error shown below
   pushd \\bambi\c
   The system cannot find the path specified.

Does anyone have any idea why this is happening?

Thanks

john