I have a local workgroup network.
It has one ubuntu 10 LTS machine, two XP boxes and a Windows 7.
I everything works great eccept for the Widnows 7 box. I can see it and access it from the other boxes, including the ubuntu one.
From the W7 i can access the XP's and I can see the ubuntu machine, but if i try to Map Network Drive it fails to authenticate the user (i can use that user/psw from a different box).
[EDIT] Windows 7 Home Premium seems to be missing the Local Security Policy editor