Win64:Evo-gen (susp) - again and again

I did a full scan Nov 11 and Avast found Win64:Evo-gen (susp) in my C:/windows/temp folder - it found 172 of them!!!. Avast deleted 100 of the files, and moved 72 of them to the chest. I thought I was done, but ran a scan today, Nov 6 (almost a month later), and again Avast found Win64:Evo-gen (susp). This time Avast found only 11 of them, and Avast deleted them all. I am not tech-savvy and don’t know if this means there is a problem and if all my passwords for financial stuff are now compromised. Please someone tell me if there is anything else I should be doing. I am very worried. Thanks

If you want someone to have a look, follow the instructions in :
https://forum.avast.com/index.php?topic=53253.0