UAC in Windows Vista RE: 5.0.51a Installation Guide for Windows Vista

[Benjamin Bengfort]

It seems that the real crux of the problem here is that you can't naturally run MySQLInstanceConfig.exe as administrator; because when you right click the file and show its properties, there is no "Run as Administrator" choice. UAC blocks any program that thinks it can run as administrator without verifying with UAC.

Changing the script to requireAdministrator allows UAC user input as to whether or not to allow the program to run as administrator and runs the program correctly. To get around this, you can change its properties to "always run as administrator" and then circumvent the UAC.