Mike,
I would restore the Zone Alarm control panel and click on "Program Control". Then look for the green check-marked items and switch them to "?", to make it ask you if you want to allow access. You can always put them back. If no luck there, I guess i would check Task Mgr for applications and/or processes that don't look right. Finally, you can check the router log if you have one.
Good luck,
Joe
