dam, i thought you were serious vg..i was kinda gettin scared with the porn part.. :?
anyway i use:
Zone pro alarm
avg
privacy guardian
microsoft antispyware
Advanced System Optimizer
Ad-Aware SE Personal
Spybot search and destroy
and i did have spy doctor but my dad accidently deleted it.
Keep them all updated and have as much protection of different types as possible, and yes, firefox helps..but i do miss the smell of IE...replacing the IE icon with a FF one really helps..