I installed Backendless 3.0.0.-18 on Windows 2012 Server R2 without any problems as seen in other installations on Win 7 - Win 10. I didn’t have a Antivirus program installed.
What I did notice that the Firewall dialog didn’t appear during the installation. I went into the Windows Firewall and added a Firewall rule for port 80 and 443. At this point I was successful in logging into the standalone server from another computer.
I performed a reboot and the playserver service did not start. I deleted the file C:\Bitnami\backendless-3.0.0-18\apps\backendless\htdocs\RUNNING_PID and restarted the playserver. The playserver service continued to execute and I was able to login to the backendless standalone server.