28,659 questions
Reboot once, see if the error is gone.
Also, suggest you to set msiexec.exe process to Automatic Startup type rather than Manual, using Services snap-in.
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When I am installing any .msi program, "Another installation is in progress. You must complete that installation before continuing this one." error occurs, but no other installation is running. And after any installation, the msiexec.exe process does not stop and continues running. Looking for a permanent fix.
Reboot once, see if the error is gone.
Also, suggest you to set msiexec.exe process to Automatic Startup type rather than Manual, using Services snap-in.