If you have read through the entire thread, people were having issues with McAfee, Spybot S&D, etc. adding their own HOSTs file entries. This is the first suspect I believe. Honestly, I don't have any help for you. This is a very common issue, and beyond those who have had it fixed by the script in this thread, most have no joy.
I have not heard of anyone having this issue with Vivaldi, a Chromium based browser, as Chrome is. I have never heard of anyone having this issue with Vivaldi. It is my preferred browser, you might give it a look.
A Guy