Windows 7: Windows 7 machine cannot connect to Vista machine

Hi,
I've checked here and on a couple of other places; many people seem to have similar problems but not similar enough that I've been able to solve it.

I have a HOME workgroup on my Vista machine that is connected to the printer I want to share. I have made HOME the workgroup on my Windows 7 laptop. The Vista machine is able to access folders on the Windows 7 and the Windows 7 "sees" the Vista machine... the network map on Windows 7 shows a "dotted" line from Windows 7 - Vista but when I try to connect from Windows 7 to Vista it will not accept a logon. I have tried using my normal Vista machine User Name and password and even tried creating a new one just for this connection but Windows Security always says "Logon failure: unknown user name or bad password".

One of the other sites suggested that Client for Microsoft Networks needed to be installed on the Windows 7 laptop but when I checked the properties for the Windows 7 NIC there was no Install option... does Windows 7 need Client for Microsoft Networks?

All settings on the Vista Sharing and Discovery are on.

TIA

I finally figured out that it was Vista machine firewall (AT&T Internet Security Suite by MacAfee) that was blocking the Windows 7 machine from accessing the Vista machine.

After I checked the box in Port and System Services to allow RDP access, I was able to access both the Vista computer and its attached printer from the Windows 7 machine.