[Satcomer]

Well we need MORE information on what you are trying to do! Is this a Windows Server domain? Maybe this is a just a home setup, is it?

Did you read the article Sharing files between a Windows Vista Home Edition PC and a Mac running OS X Leopard 10.5? Did you on the OS X leopard Mac launch System Preferences->Network - "Advanced ..." button then the WINS tab to bind OS X to a Windows Active Directory server? Also did you launch (in OS X Leopard) System Preferences->Sharing and in Sharing select "File Sharing then click the "Options" button to select the sharing method (SMB for Windows)?

Please state what exactly for setup is like because sharing in a Home network is different then sharing in a Windows domain.

Lastly if this is for a Windows domain then you should always consult the web site MacWindows.com. This site is dedicated to get a lone Mac on a Windows domain, that is all they do. One tip was really good:

(1) Make sure your time zone is set correctly.

(2) Make sure your Date/Time are auto set by the system. Or that it is VERY close to what the AD server is set to (if it's off by just a little it won't work).

(3)Make sure your using your full domain, as in "domain.company.ext." Not just the short name for it.

(4) Make sure the checkbox to allow domain administrators to administer the box is checked.