I have a wireless network of 1 labtop running windows xp professioanl
and a desktop running windows 2k professional.the two computers can
connect to the internet but a shared folder on the desktop, the labtop
cant access it. How can i access the shared folder on the desktop.When
I open the my network places icon on the desktop, i can see the two
computers but when I double click the labtop icon, so that i can see
the files, it gives me error message saying, the ||name of the
computer not accessible the network path was not found.If i do same
process from the labtop, it says the same error message but all of
them can connect to the internet.Any help of how to configure the pcs
to talk to each other

Hi
A couple of possibilities. 
Do you have firewalls running on either machine? If so turn them off
briefly and see if that solves the problem. If it does, you need to
change the trusted zone permissions to include the IP addresses for
the individual machines or the range of your local network. Exact
method for this will vary depending on the individual firewall.

If that does not work try the solutions here:
http://support.microsoft.com/?kbid=318030

also make sure there is no vpn client running on your desktop. 
and
you have enabled the printer and file sharing in network properties

make sure the usernames are on both computers (your login names)
after then 
http://support.microsoft.com/default.aspx?scid=kb;en-us;304040
its most likely a permission problem 
more then likely that page will solve your problem.. it has a video too!