Maybe you could be a little more clear. Are you using steam for starters? (it almost sounds to me if you downloaded half-life and are tryying to play esf on WON, and I know that 1234567891234 is a fake WON cd key, and WON is no longer supported). Asking for warez = bad.
Go get Steam, create a steam account, buy a legal copy of half-life and register your cd key through your steam account. Let steam gather the required game content and then launch half-life, run the training room, walk around for 5 seconds and then exit. Once this is done go get the esf1.2.3 full installer and proceed with installing esf.