Just had exactly the same problem Highlander. I tried everything, but to no avail, in the end I took my PC into the repair shop that I have used for many years now. He said that this particular malware (offerasoft) made it impossible to use the Internet. He ran a number of programmes and finally got rid of my problem. Apparently it's all to do with a Russian guy who is now in prison, but has yet to tell how to eradicate the problem! He also reccomended that I install malwarebytes pro as unlike the free addition this will continually run in the background.