- If you bougth CS or HL you have a valid CD key which allows you to use Steam.
- Go to www.steampowered.com and download the installer (GET STEAM NOW)
- run the installer
- DON'T allow the installer to copy files from your old (CS 1.5) installation! Do this later by hand or you might get into trouble...
- DON'T allow the installer to erase the old files, this is your CS 1.5 installation, unless you really want to do this - and I doubt about that.
Your account is created during the installation process, be sure to use a working e-mail address otherwise you're unable to confirm your account...
If you install a scriptpack for CS 1.6 please check your installation path at first. SoUlFaThEr reported that the pathname has changed for new accounts, they no longer use the e-mail address but the account's name for new accounts.