How to stop PB from kicking you every couple minutes...

PunkBuster kicks you whenever it detects a program that uses an overlaid popup from the toolbar. Some examples would be Windows Update, some FPS displays, uTorrent. Just exit any such programs and PB should stop kicking you.

steam.

Yea, disable the in-game community in your Settings.

Great post, something I want to add to this is download pbsetup.exe and update your PB. You will need to add cod4 when you download it, just click on "add a game" and add call of duty 4. The rest is pretty self explanatory. Download pbsetup.exe HERE.

Yea, what Jim said. It's a bit silly that PB doesn't prompt you to add games automatically, imo.