Vista - Remote desktop can not use XP pro as host

My home network is composed of XP pro computers. They are all on my
workgroup "Fred". I now have a Vista Home Premium 64 bit machine. I put in
on "Fred" too. All the computers can see each other. They can all access
each other's shared directories. When I start Remote Desktop on my Vista
machine I can browse to the XP computers. But when I get the message "This
computer can't connect to the remote computer .. try again" I just had one
success giving Remote Desktop the IP address of the computer instead of the
name it complained it couldn't verify the computer name but then let me. I
couldn't do that before. Vista has SP1 in it like a KB article said. The XP
computers have LLTD on them. The Name vs ip address may be a bit of a clue,
If I ping CTRAVEL (an XP computer) from another XP computer it pings
192.168.1.100 which is correct. But if I ping it from my Vista computer is
pings 207.69.131.10 which is wrong.
Any ideas?
Thanks
Chas