Windows Remote Desktop problems

I finally upgraded my main home PC to an XP Pro box.
I am trying to set up Windows Remote Desktop to Win 2000. I can connect from the 2000 PC to my XP but not from my XP to 2000.
It is a peer network via a Belkin Cable router. I can ping both ways, I can see the workgroup PC’s, map network drives, … what am I missing???
I have been installing software and moving files for several hours and my brain has hit a bad sector!
Any ideas or links??