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When starting to install ArcGIS, the system returns the error:
Error: Windows Installer cannot be accessed
The MSI Server ImagePath registry setting is incorrect.
Change the ImagePath string value under HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSI Server to point to the correct location of the msiexec.exe file.
Warning: The instructions below include making changes to essential parts of your operating system. It is recommended that you backup your operating system and files, including the registry, before proceeding. Consult with a qualified computer systems professional, if necessary. Esri cannot guarantee results from incorrect modifications while following these instructions; therefore, use caution and proceed at your own risk.
c:\windows\system32\msiexec.exe /VClick OK in the Edit String dialog box and exit the Registry.
msiexec /unregisterand press Enter, followed by
msiexec /registerPress Enter.