Hamachi is a bad way to run a server.
You can either rent a dedicated from a company, which I offer or, you can set it up manually.
You only need one file, if you're running vanilla Minecraft.
Go to Minecraft.net and download the server software.
Place it in a folder and then run it.
Go into server.properties and change online-mode to false. This is not a cracked server.
Now you have to port forward. This is too complicated to explain here, but ask me if you need help.