Farbar Logs attached
Please refer to https://forum.avast.com/index.php?topic=53253.0 and follow the directions for attaching the other logs:
- MBAM
- FRST.txt
- aswMBR.exe
After posting your logs, do not attempt to repair or play around with your machine. Someone will review your logs and a malware specialist will assist you.
Does this occur when you go to websites with video ads on them ?
CAUTION : This fix is only valid for this specific machine, using it on another may break your computer
Open notepad and copy/paste the text in the quotebox below into it:
CMD: bitsadmin /reset /allusers CMD: DEL %TEMP%\*.* /F /S /Q CMD: RD /S /Q %TEMP% REBOOT:
Save this as fixlist.txt, in the same location as FRST.exe
Run FRST and press Fix
On completion a log will be generated please post that
I haven’t noticed if it exclusively happens while I’m on sites with video ads, but it’s definitely more frequent when I’m on such sites.
Ta… I am now thinking FP and I will check it out
Since running the fix, I have not seen it even on the sites that were triggering the effect most often.
Confirmed false positive
Subject to no further problems 
I will remove my tools now and give some recommendations, but, I would like you to run for 24 hours or so and come back if you have any problems
Now the best part of the day ----- Your log now appears clean 
A good workman always cleans up after himself so…The following will implement some cleanup procedures as well as reset System Restore points:
Click Start then Run.
On Windows7 or Vista you may use Start Search field if Run is not available.
In the box copy/paste the following command:
ComboFix /Uninstall
Note that there is a space between " ComboFix " and " /Uninstall " .
Then click OK (or press Enter ).
Wait for the uninstall process to complete.
Download and run Delfix
https://dl.dropboxusercontent.com/u/73555776/delfix.JPG
Now that you are clean, to help protect your computer in the future I recommend that you get the following free programmes:
CryptoPrevent install this programme to lock down and prevent crypto ransome ware
https://dl.dropboxusercontent.com/u/73555776/CryptoPrevent.JPG
Update and run weekly to keep your system clean
It is critical to have both a firewall and anti virus to protect your system and to keep them updated.
To learn more about how to protect yourself while on the internet read this little guide Best security practices Keep safe 