A short pre-history. So, I haven't used any antimalware software for a pretty long time, about 3 years or so. I only used Dr.Web Cureit! or something by malwarebytes to check if there's any viral stuff once a couple of months. It actually never found anything. Recently I had to change my PSU unit and my Win7x64 wouldn't load after. After a couple of hours spent in vain trying to make it load I gave up and just reinstalled the system. A few days after I noticed a problem. My hosts file looked like it was infected for sure. It seems that something wants to prevent me from going to avast website lol. So I did a full scan with Dr.Web Cureit and it found a couple of infected files and healed my hosts file. Everything was chill untill after a couple of PC reboots the hosts file was infected again, and UAC went from disabled to enabled (yeah I always set it off and never had any problem before). I don't actually know how to deal with this sort of thing because I've never encountered something like that. What should I do?
This is what my hosts file looks like at the moment https://pastebin.com/dXLsHJeY