modem on Windows 2000

I have a basic 56k modem and dial up account on a windows 2000 machine . I can dial up just fine but no programs can (IE or netscape or ftp program) connect. I do get a ping and my isp says im logged on on their end just fine ??? but again no programs will see the connection ,is there a trick on 2000 or sometype of built in firewall that i should know about . I can see my LAN just fine. Thanks in advance!!!

Darren