Yea, you gotta have a MySQL database setup for it to work; MySQL is vaguely like a spreadsheet program that npcx stores data into. My server runs on Linux and with hamaichi I'm assuming yours is windows, so I'm sorry I can't help you with setup.
oops, i guess that read different than what i meant. What I meant to say was my server is on Linux. And you said yours uses hamachi, so that must mean yours is on Windows. So i can't really help you because setting up MySQL on Linux is very different from doing it on windows. Sorry for the confusion.