I have 3 computers on a network over a linksys WRT54G router. A netbook running XP, an HP laptop running Vista Home Premium SP2, and a MAC running OS 10.5.8. All 3 show on all computer network locations and I can access files between each of them EXCEPT the HP Laptop under VISTA to the MAC. For that connection, VISTA wants a user name and password and I enter the same (and only user) name that I have on the MAC and I get the message that Windows cannot find that machine and asks me to check the user name/password. I use that same user/password combo when accessing the MAC from the XP Netbook, it works fine. What can I do in VISTA to get to the MAC. I know that the user name/password I am using is the only one that exists on the MAC. I also have 2 printers attached and they both work fine on all 3 computers.