This from Malwarebytes and this from BleepingComputer. You might have had PC Cleaner Pro installed but now removed? My humble opinion is that you're living dangerously. Having said that, just helped a neighbour with connection problems and she runs no anti anything and has been doing so for two years, on XP.
Sony Xperia Z5 review: Hands-on with the phone which the Z3+ should have been