PunkBuster Problems..HELP!!

I'm trying to play Call of Duty 4 on my PC. It runs smoothly and I recently updated it to the lastest patch off of this website. I also downloaded the latest PunkBuster file, and added COD4 to it's list and ran updates for it too. Also my Windows Firewall has checkmarks for both "PnkBstrA" & "PnkBstrB". All my drivers are up to date and my internet is fine. My username is Shaz when I play COD4 and for some reason I am getting this message:

NOTICE

shaz PunkBuster kicked player "shaz" (for 0 minutes) ...

RESTRICTION: Service Communication Failure:PnkBstrA.exe

Does anyone know what this means? thanks a lot in advance!

it's supposde to say

RESTRICTION: Service Communication Failure: PnkBstrA.exe

OK I figured it out if anyone else has this problem then make sure all your stuff is updated like mine and then go to services.msc...check out punkbusterA and make sure the status is automatic

cheers! =D