[HELP]Hamachi Private server

Hey i have a friend who has a hamachi private server and he has Windows 7 but He/all cant login so i dont know if it because the win 7. I Need Help!
vTut/tTut :)

my hamachi private server works with windows 7
that is not the problem

GreeTz Mike

make your FireWall down / Off and try it again.

Thank you guys :)