No, people are able to join my games and as you say, I dont think drivers will solve anything.
But I'll try the new folder thing and i'll give you feedback on that.

A) Yes, Thanks, for the reply. I can host games but I cannot join them. B) Pardon my thickness, but I'm not sure what you mean. Could you go into more detail? C) No blackbox.txt, but debug.. Largest server letter sent : 161 bytes Largest server letter sent : 212 bytes Requesting data from MetaServer...

I bought the game recently, and when I tried to start it, every time I clicked 'new game' or anything of the sort, the game crashed. I managed to fix that by patching it up, but now I can get onto the multiplayer menu, but as soon as I click join game it just says 'defcon.exe has encountered a probl...