Once that is, run steam. A menu should pop up. Click Play games, then right click Half Life, and install. If it already is installed, then click play game. Play it once, then get the 1.2.3 installation of ESF at http://www.esforces.com
Install that into: steam\steamapps\email@example.com\half-life. Install, then open Steam (if the play games window while you installed and afyter, then open and close). Then under '3rd party games' there should be a game labeled 'Earth's special Forces'. Double click and a loading thing should come up 'Loading Half-life'. This is normal, just wait and let it load and play.
If you honestly cannot understand this, PM me or something. I'll hlep you step my step.
I downloaded the game today and when getting to the browse folder area of the installment i cant click on the "install" button. Now ive tried all different folders possible but it still wont work. What do i do?