You are using WON, you need to play ESF with Steam. This explains how:
ESF will NOT work with any game other than Half-Life 1
1.
Download Steam.
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 1 case.
3. When Steam is finished updating, turn it on.
4. Under the "Games" selection in the Steam toolbar, select "Activate a product on Steam..." and input your CD-Key.
5. Once your CD-Key is authenticated, download Half-Life 1 from Steam and let it update completely.
6. Once that is done, run Half-Life 1 once.
7.
Download ESF v1.2.3 full installer.
8. Run the installer.
9. It will point to the correct directory for you, so just hit install. The directory should look
somewhat like this :
C:\Program Files\Steam\SteamApps\
Your Account\half-life\esf
10. ESF should now appear in your games list.
11. Double-click and enjoy!
Note that you need a valid cd key of Half-Life. Not a keygen-generated one, an original one, which can only be obtained by buying the game legally. And read all the other stickes before asking for help again, which include but aren't limited to:
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How to install ESF
Frequently Asked Questions
Newbies Guide to the ESF Forums
How to ask for help
Acceptable Use Policy (AUP)
And don't ask how to get the game working with WON, because it's impossible, and you won't get help here.
