okay mike, two things.
1) source is for pansies. 1.6 is what the ogs play.
2) you will not get it to work without a legit cd-key. valve's steam system has been around for a while and is pretty secure. your only way out without buying a retail copy of half-life is to either steal a cd-key or find a way to generate one that gets authenticated by valve's servers when you log into your steam account.
don't wanna be an ass just don't want you to get your hopes up