After you manually start McAfee Agent 5.x Service, do not start the McAfee Agent Backwards Compatibility Service.

This service is set to 'Manual Start', and must never be started manually. This service is called by the McAfee Agent Service, and started when needed.

When the McAfee Agent Backwards Compatibility Service is set to Automatic Start, it must be changed to Manual Start.

If a Group Policy Object (GPO) is defined to set this service to 'Automatic Start', it must be deleted, or changed to set the service to 'Manual Start'.