I'm having the same issue. I'm trying to get one of my computers back online w/ Hamachi2 but to no avail. I figured a clean install. Nope, I can't uninstall. I know they're upgrading stuff this morning... I'm hoping this fixes all.
Maybe this will help someone in the future. Delete (or to be more conservative, rename it by appending an X to the key's name): HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Installer\Products\2F1C8FD962ED3D9409B931C2C3A5EC6B\SourceList