When i try and play esf on-line, it says that my cd-key is not valid with valve games. What is it that i have to do to be able to play on-line? would i have to go out and buy another Half-life cd and start over?
If you bought the copy of Half-Life and the CD-Key has been taken, then someone who downloaded Half-Life generated and used your CD-Key. This situation disgusts me, I would say e-mail Valve about this, they may supply you with a new CD-Key.