Thanks for yoiur reply Matt
LS-2w.0TGL/R1-V3 that works is joined to the domain and user list was nicely pulled from my domain controller
Since LS-Q6Tl/R5 (that we're having problems with) didnt had that option Im using my domain name as a workgroup name
and for authentication Im using "Authentication Shared Folder" option from Network menu and my PDC as an authentication server. that worked perfectly on XP machines
on win 7 machines - its not even prompting for share password's
error that im getting is:
Windows cannot access \\buffaloNAS
Check the spelling of the name Otherwise there might be a problem with your network.
To try to identify and resolve network problems click Diagnose.
Error code 0x80070043
The network name cannot be found