Net Watcher, I need to log activity

Hi,
Is there a way to get Net Watcher to log connection
activity? Or is there a third party utility that can do
this?

In the past we have had problems with viruses coming in
over the LAN. Using Net Watcher I have actually witnessed
a computer attach and write infected files to these
computers. It would be very helpful to be able to log
this kind of activity.

Thanks!