Error 1500, Another installation is in progress.

I have the following error, installing on a client machine (Windows 10): Error 1500, Another installation is in progress. You must complete that installation before continuing this one

I searched the web and found the following:

Launch the Windows Start menu.
In the search box type services.msc and click OK.
In the Services window that opens up scroll down and look for Windows Installer.
Select Windows Installer and Right Click and select Properties.
Click on Startup type drop down and select Disabled.
Click Apply and then Click OK.
Now Restart your computer.

However, when i Right Click on Properties the startup drop down is grayed out and I can't change it.

Does anyone know how to fix this, or know of another solution?

Thanks in advance.
Clive BeatonAccess DeveloperAsked:
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Robert OrnelasVP Operations at Cook's ComputerCommented:
Seth SimmonsSr. Systems AdministratorCommented:
did you reboot and try the installation again?
why would you want to set the windows installer service as disabled?  you won't be able to install or remove anything if the service can't run
does the specified account have local admin rights?  if not, you won't be able to make changes to services
Mal OsborneAlpha GeekCommented:
Really obvious first thing to try is a simple reboot. A previously installed program may be waiting to copy some in-use files, which it will do at next reboot.

Have you tried a reboot?
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Clive BeatonAccess DeveloperAuthor Commented:
reeboot done,

"why would you want to set the windows installer service as disabled? " because that was what the advice in the suggested link was.
Seth SimmonsSr. Systems AdministratorCommented:
reeboot done

and?  is it working now?

because that was what the advice in the suggested link was.

understood...just makes no sense
Clive BeatonAccess DeveloperAuthor Commented:
No, not working.
Hello ThereSystem AdministratorCommented:
Perform clean boot and try again. Some third party app/service might cause it.

Run msconfig -> Under Selective Startup, click to clear the Load Startup Items check box -> Click the Services tab, click to select the Hide All Microsoft Services check box, and then click Disable All -> Reboot
Clive BeatonAccess DeveloperAuthor Commented:
Forgive my ignorance but is a clean boot different from Shutdown and Restart?
Hello ThereSystem AdministratorCommented:
A clean boot is performed to start Windows by using a minimal set of drivers and startup programs. This helps eliminate software conflicts that occur when you install a program.
try running sfc /scannow from an elevated dos prompt
you can start that by right clicking the start button - select Windows Powershell (admin)

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Clive BeatonAccess DeveloperAuthor Commented:
Forgive my ignorance, again, but what is an elevated dos prompt?
Hello ThereSystem AdministratorCommented:
Run CMD/Powershell under admin account.
i posted it - 2nd line of my post
Clive BeatonAccess DeveloperAuthor Commented:
Thanks you all.
CRB - can you honour our effort by posting what was your solution ?
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