Hamachi: Tunneling Problem - VPN Error

Hey, i'm writing this for a friend, he has never been able to use Hamachi he has a triange on he right side that either says offline or tunneling issue sometimes something else, weird thing is that when he downloaded hamachi it never asked windows for permission to use hamachi's vpn and it does for me. and also hamachi is not under networks in the sharing centre thing, we have tried alot of diferent thing but not working. if i go to settings in hamachi it also says there is a problem with vpn and adapter, its like it never connected. i also checked device manager and hamachi is not there under internet adapters