mentions to post the log file. I don't see that.
"Error 5" is probably a Windows error. That error indicates that you do not have the required permissions to access a file, admin or not. The installation of a tool like Minion can't be resolved with an update or fix when it is a Windows message because programming tools used to make tools and installers like Minion respect Windows permissions.
The second link are the troubleshooting steps. You have to try them all in order. Especially steps 3, 4, and 5 could give you some results as I have made tools for single player games and it's fairly well known to never install things into Program Files because of permission issues.