This is pathetic. I don't know why im having this problem but i didn't have it before. Im using Half Life 22.214.171.124 and ESF 1.2.3. When I install Half Life it just needs the CD Key once and works correctly when i start a new game. but when i install ESF and play any level Offline for fun against Bots when i create a game and choose any level and a while after the console is loading, it tels me your half life cd-key is invalid please enter a valid half life cd-key. If i enter a wrong one it says key is invalid. If i enter my correct cd-key it accepts but quits the created game and brings me back to ESF main menu and when i create a game it keeps quitting saying you dont have a half life valid cd-kay even though i keep entering it. Please HELP!