MacInstall fails to quit.

Hello guys,
lately my MacBookPro fails to quit. Whet I hit Shut Down, the laptop does not quit and warning comes up: MacInstall fails to quit.
I only manage to quit the machine by force quit.
Is there anything I can do to fix it? What is MacInstall anyways?
Thanks

MacInstall is a third-party installer application that some software developers use instead of Apple's Installer application to build installation packages for their software. Evidently you've installed some piece of software whose developer used MacInstall, and for whatever reason, MacInstall isn't quitting as it should. Force-quit it, then use Spotlight to locate MacInstall on your hard drive, trash it, and empty the trash.

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