There are some strange issues on that system that may have been caused by attempts to remove a virus...is that the case?
In the
FRST report you PMd, the following are running:
HKLM\...\Run: [Advanced Spyware Remover] => C:\Program Files\IObit\Advanced Spyware Remover\ASRtray.exe [1213952 2009-12-15] (IObit)
This is not a program I would recommend. There may be other members here of the same opinion.
HKLM\...\Run: [AVG_UI] => C:\Program Files\AVG\AVG2015\avgui.exe [3745232 2015-04-15] (AVG Technologies CZ, s.r.o.)
To my understanding, installing AVG2015
disables Windows Defender.
When did you install AVG2015? Was it on 2015-04-15? Is that when your problems with Windows Defender began?
Have you tried restoring the system back to that date, or even later if a Restore Point is available?
This tutorial will help:
http://www.sevenforums.com/tutorials/700-system-restore.html
As far as the
Farbar Service Scanner tool, do you not get the following options to check?