Kazaa and other P2P programs in Win 2000

just set up 3 Windows 2000 machines and everything is working fine with the exception of the fact that none of the P2P Music share programs work. They install fine but they will not connect. I checked the settings and they match exactly with the Windows 98 machines (and the Windows 98 machines connect with no problem), but they still will not connect. I have a friend at another firm who has a Windows 2000 machine that use to be able to download music but recently it stopped working with the same problem I’m having. Any ideas? Thank you for your time in this matter.