Error message: Windows Installer could not be accessed.

A maintenance program that I run called System Mechanic deleted my Windows Installer and I think messed up its registry.  Everytime I try to reinstall the installer, I get an error that reads, "this update is not for your version of windows."  I tried all the available downloads.  Nothing works and I'm afraid that a full system restore is my only option.  Furthermore, none of my restore points of work to solve the problem.  Is there something that can be done?

Start with this tutorial from Microsoft Support:

http://support.Microsoft.com/kb/2642495#top

Another tutorial

http://www.Winhelponline.com/blog/Vista-the-Windows-Installer-service-could-not-be-accessed/

Past responses to this forum on the same topic:

http://answers.Microsoft.com/en-us/Windows/Forum/windows_vista-windows_programs/the-Windows-Installer-service-could-not-be/4153caff-17d0-4EB8-916F-33ad07f2be75?page=2

Tags: Windows

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