I have the same problem with samba shares and total commander ( error 53 ) but i have found a workaround for this problem.
Ubuntu 10.04 LTS
Windows mobile 6 (CE 5.2.1620) on HTC Artemis
Total Commander V. 2.51
To open a Windows share (samba) first make sure you have the LAN connectivity. To do so open any www in WM IE (e.g. Google.com).
Now open TC and do not go into \\Plugins. Just start typing in the address bar.
You can copy/paste the address if you have Ctrl button on your soft-keyboard since tap&hold method does not work on this address bar (donno why, someone ask TC authors :P )
Syntax as before:
click 'Enter' on your soft keyboard.
That worked for me just fine without changing anything in samba conf files.
Let me know if that works for you too.