Internet connection problems

Recently did a fresh install of my system and since then everytime that I connect to the Internet the connections has constant activity even if I´m not doing anything, haven´t been able to trace down wich app is giving me this trouble, what can I use to track down the quilty one?

Already have installed both Spybot S&D and Ad-Aware but nothing seems to be wrong for them.

I´m using Win XP Pro SP1 with a dial-up connection.
 
if you install a "firewall" software, it will tell you what program tries to connect the net;

Greetings from
Duracell
 
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