The MSI Installer service is not running properly, possibly due to corruption or other issues.
Check that the Microsoft Installer (MSI) is working:
If working, verify the Installer service is not disabled:
Install the latest Windows software updates. Don't forget to check for non-critical updates too!
To manually get updates, open Internet Explorer (you can't use a non-Microsoft browser for updates).
For IE 8 and later: Click on Safety, then Windows Update. Follow the instructions.
For IE 7 and older: Click on Tools, then Windows Update. Follow the instructions.
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