You can't run ESF with CZ, but you can run it with the retail version of CS 1.6. However, keep in mind that, even though you can download CS 1.6 through Steam, this will NOT allow you to play ESF, because ESF needs some files which it doesn't download.
You will need either the original Half-Life (Not Half-Life: Source) or the retail version of CS 1.6.
Yeah, I advise you to keep your cool. Pain's just trying to help you. It's against the rules to talk about warez on these forums. It's in the AUP, and when you enter these forums you have to check the box that says that you read and understood the AUP.
It's not our fault you didn't actually bother to read it.
If you want to leave, go ahead. One player more or less doesn't make a difference to us.