In Windows 7 (and higher) the Windows Event viewer shows you a lot more. Although this info can be overwhelming, it is very useful.
Go to the Windows Control Panel > Administrative tools> Event viewer
A Window will open. Maximize it as the information that will be shown to you needs all the screen real-estate it can get. On the left is a tree view, select option 'Application and service logs'
New options will appear, select Microsoft > Windows > Windows Firewall With Advanced Security > Firewall.
On top of the center of the screen you will see a chronologically ordered list of events that took place. Select any event and the bottom half in the center of the screen shows you the detailed information of the selected event.
Now, most of the occurred events are likely not that interesting, but events with event id 2011 could be. Events with that id show a network communication attempt with any application (including port, process ID and complete file path) on your system. Searching on the internet with the application name and port number will show you if the communication is benign or not.
My computer only has its standard firewall enabled, without anti-virus. If you have another firewall and/or anti-virus solution enabled, I am sure you will find it in the 'Application and service logs' section of the event viewer.