the client.dll problem occurs when somebody has the wrong version of fmod.dll in their half-life folder. Get the right one here: http://members.rogers.com/jeffcraigisu/files/fmod.zip
Put it in your half-life folder.
If you've got the newest SvenCoop installed(another mod) you should check out the fmod switcher available at their site since ESF and SvenCoop use different versions of fmod. This isn't a problem if you haven't got SvenCoop.
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