Instashare ads

Hi, I have recently replaced my PC and moved to Windows 8.1. About a week after starting to use the new machine I have caught a bad dose of Instashare ads that pop up and invade most of the web pages I am viewing. It plays video ads on BBC news pages, overlays Amazon with some other ‘deal’ ads and plays annoying audio ads over Spotify. >:(

I have run the scan on Avast, blocked pop ups in my browsers (Chrome and IE) and even downloaded a popup blocker extension for Chrome without having any impact. Any ideas on how to get rid of this would be really welcome.

Attach your basic logs. (MBAM, FRST and aswMBR…!!)
Instructions: https://forum.avast.com/index.php?topic=53253.0