Okay I found out why I couldnt play a multiplayer game of Half life before. It was because i had to download update 22.214.171.124 . I completed downloading it today , and well when i try to play a multiplayer game it keeps on asking me to put a cd key . Whenn i put in the cdkey it says it is valid [correct] , but when i click on a game. server to join , it keeps on asking me to put in a cd key even when i put in the correct one. Is there some type of patch that can fix this ?