comodo, cod4 & punkbuster

Not sure where to post this, whether it is a bug with the firewall, or just punkbuster being annoying etc.

Im having an issue on my brothers pc where, after installing cod4 with punkbuster, upon running cod4 the firewall alerts for it will be behind the game, & i cant tab out to allow it to run.

Anyone got a workaround?

p.s. im using vista & pressing ctrl-alt-del brings up the task menu which allows me a way of “tabbing out” of the situation.

Windows Key?
This works on Windows Media

Greetz, Red.