Just spent a couple hours troubleshooting a punkbuster b communications kick after upgrading to Win7 . It seems that punkbustera and b were not running as services but were allowed in the firewall settings. I had to get pbsvc.exe from evenbalance and ran it and it fixed the issue. Hope to save some people some time.

                                                                                                           Xman01

I don't believe I had that issue.  Though I did Win7 as a fresh install.  That could be why.