Filesharing woes between XP and Win2000 using microsoft wireless products

Hi,

I have a deskptop with Win XP Pro on which i have shared
the files and printer (simple files sharing). I have a
work laptop (win 2000 Pro) configured to work on a domain
(XYZ),wireless card (MN720) with soft firewall.

I can access the internet from both machines. From the
laptop can see the desktop in network devices list but
not vice versa i am guessing because of domain-workgroup.

I am not able to access the files on the desktop i get
the error "\\pc-name is not accessible. There are
currently no logon servers available to service the logon
request". Please help.
..