BF2S Forums Help me please!!!!

I just Installed SF and i launched the game, and joined a server but when i clicked "Join Game" then it comes a message up that "You Cannot play on this server, its only for unmodified games" or something like that.......and i havent modified the SF game, and now also the UAV is called something with "Object_UAV"......and where is supposed to stand "No Vehicles" it says "SERVERINFO_novehicles" does anyone know whats wrong....PLEASE HELP!!!!!!