Forum:BC2 Not detecting any servers(PC)

I have recently purchased battlefield bad company 2 through steam because I wanted to get into PC games and heard it was awesome. It installed and updated itself after installation, it lest me play the campaign mode ok but when I try to access multiplayer it just won tdetect any servers. I already configured my firewall, antivirus and router(all ports open) and it still wont detect any servers. Have you guys have a similar problem? and if so how did you fix it? Im running windows vista home edition(ultimate) service pack one. I woudl appreciate the help. thanks in advance.