You need to tell us what you've tried, if you looked at the other threads mentioned, if you have router/firewall (including the one in xp), etc. Have you tried with more than one person? checked for any error msgs in your status window? checked to be sure you arent ignoring the sender or file type? Ever been able to recieve? Turned off scripts? Can you send? Get or recieve a dcc chat?
There are so many variables in many problems that its hard to help without more information
