Well, in the past I wasn't doing any potentially dangerous things. Plus, I was a little intimidated when I saw this.
"Please read the entire ReadMe before running the installer!
This tool modifies the normal behavior of the Wii System and therefore can cause unexpected problems.
It is highly recommended to install Priiloader only on a Wii with only unmodified IOSs!
You agree that you install this tool at your own risk, and that the author can not be held
responsible for any damages cuased by either using or installing this tool."