Do you got your problem fixed? If not, tell him to turn his Counter-Strike console on. If he got Steam, just tell him to do this: Open Steam -> Click on "My Games" -> Rightclick on Counter-Strike -> Properties -> Set launch options -> Enter "-console" press OK. Then, before starting Counter-Strike, he needs to copy your Hamachi IP. For that, just open up Hamachi and rightclick on the person, who will be hosting the server, then on Copy adress. After that, start up Counter-Strike and type in the console this: "connect Hamachi IP" without "".
So, for an example: connect 5.104.118.46