I remember that in the era of Vista, many users often encountered such problems. When installing a software, the system prompts "Cannot access the Windows Installer service", especially when installing the .msi installation package. This is the case.
In Windows 7, such problems still exist, mainly caused by the Microsoft Windows Installer service. The .msi installation package also needs to be called when it is installed, and if there is a problem with this service, it will cause the above error.
The solution is also very simple:
* Start - All - Attachments - Command Prompt
* Right click - Run as administrator
* Enter and enter
reg delete HKLM\\SOFTWARE\\Microsoft\\SQMClient\\Windows\\DisabledSessions /va /f
* Restart the system
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