To fix NSIS Error - Error launching installer or Installer integrity check has failed on Windows, rename the setup file and then move it to a different location.

There's nothing worse than seeing "Access Denied" on files and folders you know you're allowed to use. Here are some quick fixes for this frustrating bug.

These aren't like your chipset or graphics drivers where you can (and should) update them yourself, but fortunately, Windows has a built-in scan tool to help fix file system and Windows driver errors.