Sorry, you cannot play Earth's Special Forces with that Counter-Strike Package, you really do need to have the Half-Life package. You also can't play any Half-Life 1 modification with the source version, which are Half-Life: Source, Half-Life 2, and the other source games.
My advice: get HL1. Not source. Not CS 1.6 not anything else.
Half Life ONE (Original CD, mind you. NO BORROWING. It won't work. The CD key is important. If the CD key has been used to log in to steam for any account, then its over. Get a new ORIGINAL Half life CD. Its worth it, trust me.)
Its 5$ I think.
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