Dialup Networking

Have you disabled Windows Messenger? I know that it continuously checks to see if you have a connection to the Internet and have a Passport set up. (Annoying!)

http://support.microsoft.com/default.aspx?scid=kb;en-us;302089

If that doesn't help, get a software packet sniffer and try to figure out what packets the PC is sending that it shouldn't.

I need to know what type of e-mail client are you using? if you are using outlook and or outlook express you can set it to disconnect after recieving the e-mail via properties

Try using a firewall on the pc as this would stop activity that you dont want to go out such as MS Messenger. It would give details of what is trying to use the connection. Also use ad-aware & Spybot S&D as it may be spyware that has loaded itself that is using the connection.

A Free Firewall at :-
http://www.agnitum.com/download/outpostfree.html

Ad-aware at :-
http://www.lavasoftusa.com/index.html

Spybot S&D at :-
http://beam.to/spybotsd

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