2. Run the exe file you just downloaded to install steam and let it update completely. You will need your CD Key from the back of your half-life case. If you downloaded Half-Life Illegally, we WILL NOT help you as we do not support criminal behavior.
3. Go to the my games tab and double click on half life to install it.
4. Once installed, run half life once.
5. Close steam completely. (right click on the tray icon and choose exit)
7. Run steam again. ESF should appear in the my games tab under third party games.
If you have any further problems, consult the stickies in the help section. DO NOT make more threads about this subject as what I have written is the correct way to do this. This thread is now closed to prevent further discussion. Do what I have said and everything should run smoothly. If not, again, read the stickies in the help section. Everything is answered there.