A couple of days ago, I decided to update our three Windows 10 home computers to the Fall Creator's Update. Two home computers updated okay, but had some minor glitches where I had to reinstall some programs to get them to work properly. My own computer refused multiple upgrade attempts, but I finally succeeded by using a file downloaded from Microsoft to do a Repair Upgrade. It also had some minor problems, and I was gradually reinstalling some programs on it too.
In the middle of this, I choose to visit some old bookmarked websites using Firefox v57 to look up info on some older computer games. While doing so, some of the old bookmarked websites were found to be no longer working - no problem, but while accessing some other game websites, I got a screen giving me visual and audio warnings that my computer was infected and to quickly click on some hyperlinks in order to save it. Wisely, i did not click on anything and either backed out of those websites or closed my Firefox browser.
I thought I was okay, but decided to run a Windows defender scan just to be sure, and that is when I noticed I was probably infected. I could no longer access Windows Settings, so could not run Windows Defender. Also, the right-click function quit working on icons in my taskbar. After a little research, i noticed that if I completely shut down my computer and physically turned off the power, then turned it back on, my computer seemed to work okay. However, if I instead just did a computer restart, the above problems would reoccur. I also noticed some strangely named folders had appeared on my C: drive, containing strangely named files, and that whenever i restarted my computer, one of those strange folders would rename & redate itself, and then replace all of the strange files with brand new strange files (various types of files, txt, rtf, doc, xls, etc.). it would not do this when I fully shut down my computer, but only when I restarted my computer.
Here are the scans I have run so far, but none of them detected anything: Emisoft Antimalware, SuperAntispyware, Malwarebytes Antirootkit, Malwarebytes Antimalware, Zemana Antimalware (and Windows Defender after a full shutdown). Also ran Trend Micro online virus scan. It said it detected three infections, but after scanning for seven hours was only 28% complete, so i quit the scan and I don't think it actually cleaned anything.
This infection has me very worried, and I do not dare access any of my online financial websites right now, so would really appreciate help in fixing this infection.
Am having trouble transmitting the FRST.txt info (keep getting a timed out message) so am sending this first part by itslef, then will try sending bits and pieces of the FRST.txt and Addition.txt files.