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Msiexec.exe is simply the Windows Installer Service that is normally started when you install a new program.
What is msiexec.exe?
Msiexec.exe is the Windows Installer Service. It’s normally started when you
install a new program, and can often be left running afterwards. It may start
automatically on reboot in some cases where the installation process has
indicated that a reboot was required, or the installation failed to complete