My computers can't see each other on the net

I'm running XP pro on my desktop wired to a Belkin Modem/Router, and XP home
on the laptop which is wireless to the Router. Both machines have perfect
access to the internet, but I can't see either machine from the other, or
share any files, although I could a few weeks ago before my daughter used the
laptop!!.
I can ping both machines from each other using the ip address, but not using
computer names.
Workgroups are named the same on both machines, and computer names are
different. I have the same password protected accounts on both machines.
If I try to view workgroup computers in My Network Places, the desktop shows
itself, but the laptop comes up with an error message suggesting
"Workgroup is not accessible. You might not have permission to use this
network resource. Contact the adninistrator of this server to find out if you
have access permissions The list of network servers for this workgroup is not
currently available"
I'm logged on as an administrator so I assume that isn't the problem.
Anyone got any ideas?
.

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