Windows Vista cannot access my XP computer through my home network

Hi,

 

I am having difficulty access my old XP computer via my home network from my new Vista computer with NIS 2009 pre-loaded. I have tried lots of things like opening ports on Vista, checking that the Workgroup name is the same.  I can see the other XP computer listed on the full network map on the Vista computer.  My Windows firewall is turned off.

 

Please advise. 

 

Thanks, Mike