FortiClient EMS Installation - Apache Service - Sufficient privileges to start system service -- 2

I'm attempting to install the FortiClient Enterprise Management Server. Apparently the installation comes with Apache server, which fails to complete the installation due to lack of Sufficient privileges to start system service. On same machine, I have other software that are also using their Apache servers and PostgreSQL DB. I presume there's conflict between their Apache and PostgreSQL servers. Example of existing software: Veemu BDR, GFI LanGuard, Desktop Central. Even after I uninstalled all software that uses Apache and PostgreSQL server, yet the installation of FortiClient Enterprise Management Server keeps failing. I want to complete the installation of the FortiClient Enterprise Management Server and ensure all services are working and that no conflict exists between the other software. I'm using the Domain Administrator credentials