Last night I looked at this again.
I set Private Firewall to training mode and " ask" for all processes.
Installed avast9 ( I used the AIS install, but only selected antivirus, safezone and program updater.)
Install progressed and Private Firewall asked permissions for numerous processes.
Restarted / full shutdown and start many times now ,without any issues.
Win8.1 64Bit . Acer laptop, Bitlocker.PF. Malwarebytes Pro.
Avast is in the Trusted Publisher list and the processes shown in the image are set to " Filter" within process control.