But then it started all over again at first reboot. I already tried:
1) The other option, that is, bcdedit
2) toggling the property in gpedit back to disabled, then re enabling it, all this with reboots in the middle, and uninstalling and reinstalling hamachi
Funny things is, the setup now installs 2 hamachi network interfaces, both with the digital signature error.
Again, consider the system is fresh. There's nothing installed on it except for hamachi