Can't connect to any servers in Battlefield Bad Company 2 :(

Hi!

My problem is that I can't connect to any server in BF Bad Company 2.

It says: "Lost connection to host, check your internet connection and please try again!" or something like that.

I just bought the game, installed it.

First problem was that it said I don't have PunkBuster, I download it and added BF Bad Company 2 to that list and then came that problem I'm here for.

Please help, don't want this game wasted!