Fix the error “The Windows Installer Service Could Not Be Accessed” when installing or updating programs on Windows 7 or Windows Vista (KB2642495)

Automatically with the following Microsoft Fixit

Microsoft Fixit 50809

Read the full KB (2642495), which also gives manual fixes and what o do if you are running Windows XP or Windows Server 2003

Error “The Windows Installer Service Could Not Be Accessed” when installing or updating programs on Windows 7 or Windows Vista

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