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8029 'Install Failed'

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I have just finished an online support session with a techie from India. Neither he nor I could get NSB to work correctly so he gave me a link to get the 8029 version and suggested I uninstall 5554 and install the downloaded 8029 (493 MB) version so I uninstalled 5554 with the Clean Up Tool and rebooted. I attempted to install 8029 3 times, as administrator and without, every time it told me 'Installation Failed'  'Installation has failed. The Windows Installer Service could not be accessed. This can occur if the Windows Installer is not correctly installed.

Error details: Installation has failed. The Windows Installer Service could not be accessed. This can occur if the Windows Installer is not correctly installed.
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Peter, I am not sure why the techie advised you to uninstall 5554 when this is a normal upgrade path to 8029, but running the cleanup tool should have had no effect at all on the Windows Installer Service.

The main times that I have hit similar error messages for Windows Installer Service have been when I have been booted into Safe Mode.

Have just checked on my Windows 10 laptop and the msiserver (Windows Installer Service) shows as being stopped in Task Manager, and as Manual in the Services plugin.

The only suggestion I can offer is to do a full Shutdown /S then restart the computer and see if that makes a difference.  Did you verify the checksum for the 8029 installer when you downloaded it?  My account shows the following details

Latest Build: #8029 (Size: 493.92 MB 2017-02-21 00:00:00
MD5: 5cd8b6576791e3263c585b6e7ef6b3d1
How to calculate and verify MD5 checksum

I'd also suggest turning on show hidden files and folders and check to see if any leftovers reall still exist in c:\programdata\acronis

c:\program files(x86)\acronis

c:\program files(x86)\common files\acronis

if those folders remain, or anything in them, you may need to take owners, then give yourself full access, then manually delete them and run cleanup again... reboot and try installing.

please ensure you always right click and "run as administrator " for the cleanup tool And/or installers!!! That is the only way to get full admin rights, even if you're logged in as admin already.

Solved. The techie advised I run 'sfc /scannow' This replaced all the Windows files that were corrupt and I was able to install 8029 perfectly. Thank you both for your inputs.

Peter, great to hear this is solved, thanks for feeding back.