I have problems with installing ESF.
when i have to choose a destination folder,
I can not choose another folder and i can not click on install what can i do about it ???????
Do I Need Half life 1 or can i use Half life 2???
It sounds like you installed from the Half-Life CD, which (suprisingly) isn't what you need to do to play. You need to install Steam. To be honest, you don't even need your HL CD, just the CD Key to give Steam. Read over that sticky Pain gave you, and do everything it says.