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I gave me cd key to my friend for half-life so he can play saying I would never play half-life again..... O man!!! so Im screwed till I get a new cd key?... crap... I bought cs:cz and everything is working fine.. cept that I cant get esf to work... great... Do I need to get a new copy of hl?

so your saying I need to install original half-life into steam so I can play esf? btw, I do have a legal cd key.

Everytime I click the ESF game in steam, it takes me to some list of games... like register your product if own blah blah with cd key. Do I put my Counter-strike condition zero cd key or what? I really want to play but cant get passed this. Someone please help me. Thanks.