The same thing happened to me about a month ago. I downloaded Malwarebytes and fixed the problem. If you have another computer, download malwarebytes onto a memory stick. Connect your memory stick to the infected computer and open Malwarebytes. Let Malwarebytes do a scan of the computer and delete any bad stuff the scan finds. It took care of the problem for me. I googled the information from the supposed “update” and found the Malwarebytes solution from a techie online!
As I said, I followed the instructions I found on the link to the best of my ability, and I hope I didn't mess anything up.