XP seems to be pretty tricky with such things.
Confirm Netbeui is on the XP (not installed by default and hidden on the cd where most don't know where to look).
Do you see yourself on each computer in the workgroup?
Confirm both computers are in the same workgroup.
You can also try and reset it up on the XP buy going to My Network Places and clicking 'Set up a home or small office network' in the left pane.
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