Newbie question here.....

Runing Windows Vista...

I set up the NAS with a user e.g. User1 with a password and have a directory they can access.

The nas is on the same network as my laptop and i can access all the folders marked with Grant Access to all just fine.

When I try to access the folder User1 has access to the windows the password dialog pops up.
If I enter User1 and their password it fails
If I try prefixing the Userame with the shares name e.g. CORZA-NAS\User1 and password I get cannot access network resource.

Help please on the correct syntax to use to log in sucessfully