Local Connection activity log in windows?

Hi,

Does anyone know where I can access an activity log for local area connection in windows?
I'm talking about the information that's given when you open the connection status dialog box by double clicking on the two flickering computer screens, and sent and received data for that session under activity.
Is there any log for this information somewhere stored in windows? Like for previous connection sessions?

A lot of extra usage has been happening on our broadband connection recently, and I want to find out if it's on my computer or someone elses on the network.

Any helped appreciated.

Thanks.
Brendan