(adsbygoogle = window.adsbygoogle || []).push({}); Ok people , yesterday i bought cod 4 for pc ,and i install it , now i go to cod 4 multiplayer , then i go to join a match , then i click on the match i wanted to join , and then it says product password in use , what should i do for fix that mates?

then is it a dodgy copy of cod?

Well if you bought it used, it means that the original owner is still playing, and still using that serial number. but you could try to click on options, then multiplayer options, where it says Key Code, click that and then 'verify' it. Quit the game then retry.