Originally published at: http://www.howtogeek.com/184374/how-to-fix-the-windows-installer-service-could-not-be-accessed-error-in-windows-7/
Have you tried to install a program in Windows 7 that uses an MSI file as its installer and instead you saw the above error? Never fear. There is an easy solution and we’re here to help you with it.
You know that box at the bottom of the Start menu? Well, if you type cmd into it you'll see cmd.exe highlighted at the top, simply press enter, or right click it to select Run as Administrator if you want an elevated prompt. Or press the Windows key + R if you really want the run box.
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