can you actually play Action Half-Life right now, or did you just find it at some website?
Oh and just so you know, you cant download Half-Life and play esf on it, you have to have a legitimate copy of Half-Life and a Legit CD key to play. your not trying to find a place to download Half-Life from, are you?
Go get steam, create an acconut and register a copy of half-life ($10-$20 in stores or $9.95 over steam). Let steam get the game content & then run the half-life training room for 10 seconds and then exit. Once you have done that proceed with installnig esf.