Installation Trouble

I haven't played ESF since steam came out, and I have been having trouble installing the game again after I uninstalled it. I'm not exactly sure which files i need now, because every time i launch steam ESF doesn't come up. I've installed beta 1.1, and the patch, and i can't even launch the game...If someone could tell me what files i need, I'd really appreciate it. Thanks for your time

ok first of all you need to do this you need to set up you steam account then install esf 1.1 in (C:/Program Files/Steam/apps/you'r e-mail/half-life) or whare ever it is then you should be able to play!