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Monitor Network Activity with TCPView
TCPView is a Microsoft program which will list all transmission control protocols on your system. It can be downloaded for free here. Any server connected to your computer or network will be listed.
You can view the address of each TCP endpoint, and see how many bytes it is using. By right clicking any one endpoint, you can terminate it.
TCPView is particularly useful for detecting which programs running on your PC are accessing the internet. Simply shutting down your web browser and email client should reduce the number of running endpoints by a few hundred. What remains may be putting an unnecessary drain on your system, and could possibly be malware.