Access Windows Server 2003 share from Windows Vista Ultimate

Hi, We have 1 windows server 2003 with a shared folder and 10 pcs running windows xp sp2 and 2 laptops running vista ultimate sp1. All 10 pcs running xp have no trouble accessing our winserver 2k3. the problem is with our 2 laptops w/ vista ultimate. It cannot find our server in the network and vice versa. I have tried the solution given by Jabez Gan from http://forums.techarena.in/windows-server-help/865686.htm
but still does not work.
Is there any way that I could remedy this?
thnx in advance