bubba, this sometimes happen with xp. I suggests updating the service packs (sp) on both win 2000 and xp. Win 2000 latest sp is sp4, while xp latest sp is sp1.
(win xp sp2 is due out pretty soon). Just go to the TOOLS option at top of INTERNET EXPLORER menu and click on windows update for each computer.
Then disable any firewall on each pc, if it's on, especially win xp internal firewall. Please post here what happen to your computers next. thanks 8) :
