Windows Installer service has stopped running?

My Windows Installer service has stopped running and it wont run again. does anybody have any suggestions or lifelines.

Run SFC -SCANNOW Command, repeatedly if it finds unfixable System files.

Look for repeat errors in logs and utilize System Resources to seek clues: troubleshooting steps

Create a new User Account in Control Panel to see if Installer works. If so, migrate to it and delete the corrupt User account.

Consider a Repair Install as a last resort before Clean Reinstalling Windows.

Does any body else have any suggestions?