Can't use "skype" with windows xp sp2?

[hermes]

SP2 has more security features than SP1,so i think it is almost certainly firewall related.

Do you use another firewall,apart from the XP one?

Thanks Reverend
I didn't use another firewall.
But it is ok now.
It is my modem problem.
Thanks for ur help.
Thanks again and again.
Hermes