I'm new to the game, as you probably guessed, and there's a tiny little problem. I can't find any servers. I played for a while last night on a server that a Steam friend was playing on (that's how I found it), but when I click on browse servers the list doesn't populate, at all. 'Start Playing' has the same problem: it gets stuck on retrieving server information forever, and consequently I'm only able to play on one server. I think it might be related to my firewall, but I have no idea how to fix that, and TF2 doesn't show up on my PC as a program to allow.