Ok here are some little tips you need to try if your punk buster will not work.

(step one)
First off be sure your loged in as an administrator on your computer, this has been a big problum with PB not working.

(For Vista users-- Make sure you have UO set up as "Windows XP Service Pack 2" in the "Call Of Duty Multi Player Properties" in the "Compatability" tab)

*To update PB go to- (step two)
http://evenbalance.com/index.php?page=pbsetup.php

*Find the box that contains this
"Operating System Version Download
Windows 3.4 For All Windows Games <-----(this is what u want)
Linux 3.2 For 32-bit Linux Games (GUI version)
Linux 3.2 For 32-bit Linux Games (Command-line only version)
Linux 3.2 For 64-bit Linux Games (GUI version)
Linux 3.2 For 64-bit Linux Games (Command-line only version)
Mac OSX 1.3 For All Mac OSX Games"

*Download "windows 3.4 for all windows games" (Step 2)

Once its installed go to add game, select "Call Of Duty" then click "Set path" and "Browse" go through you computer and find your "Call Of Duty" folder. then hit "Ok" and "Update"

If it fails to update, or continues to kick you for errors-

*Enter "Call of duty" folder in "My Computer"

*Select the "pb" folder, and delete it.

*Folow "(step two)"

PS. Be sure your max fps is set to at least 60 even if you get less than that "com_maxfps(space)60"-"com_maxfps 60"
Also be sure that you have foggind distance turned off in the proformance section of your options menu in call of duty united offecntive.

Rogueasourous

The problem that comes up for me is communication b error, if you can help me just pm me please thanks