Things You'll Need
Instructions
Ensure your computer is not connected to the Internet. Place the "Half-Life" CD in your computer's drive and wait for the splash screens to clear. Select "Install" from the menu and select a suitable install directory. By default, the install directory will be "C:\Program Files\Valve\Half Life."
Complete the install by clicking "finish" on the pop-up dialog. After the files have been copied, the installer may attempt to install additional graphics or Direct X software. This is fairly unlikely, as the original "Half-Life" game has been around since the late 1990s.
Wait for the updates box to appear. It will request permission to contact Valve for more recent updates. Do not download any updates. Later versions of "Half-Life" require a Steam account in order to validate their authenticity. You should now be able to launch "Half-Life" from the created shortcut on your desktop or the link in your start menu.