zonealarm
be careful with one thing. do not uninstall it unless you have it totally deactivated. i tried zonealarm once and i uninstalled it while it was active, by accident. after it uninstalled, i had no internet connection at all. i had to use another computer, download zonealarm, put it on a disk, reinstall it on my computer, run zone alarm, deactivate it, then uninstall it.
it was a total mess. i searched on the internet for help and i saw that many had this same problem. imo, the uninstall routine should make sure zonealarm is inactive before it removes the files, etc.