"Error in creating Game Session"

[Echodawg]

I purchased this game strictly to be able to play coop but as of yet, I haven't been able too. When trying to start a coop server I get the following error "Error in creating Game Session". Multiplayer has the same problem. I tried reinstalling the game as well as creating a new Gamespy account but nothing works. By the way, this is the pc version. Anyone else having this problem?