AVG MSI_Error 1921

Douglas, Something similar has occurred with another user (https://support.avg.com/answers?id=906b0000000D50YAAS). Please provide AVG with the required diagnostic output that was requested by Zbynek | AVG Employee (AVG Technologies).
AVG Guru

My PC says that I need to Turn On AVG Security.  I have an active license and tried to re-install AVG Internet Security, but it "fails" and comes up with:
Setup Error
Service 'AVG MSI_Error 1921
Serivice 'AVG Firewall' (avgfws) could not be stopped.
Verify that you have sufficient privileges to stop system services.
Severity: Error

What do I do?
Error Code:  (0xC0070781)
Error Message: General Internal Error
Context: AVG product installation, MSI action failed.

Douglas, Something similar has occurred with another user (https://support.avg.com/answers?id=906b0000000D50YAAS). Please provide AVG with the required diagnostic output that was requested by Zbynek | AVG Employee (AVG Technologies).
AVG Guru