1 - I have no backup, I am trying to delete everything and start from scratch as if I had bought the computer.
2- I use a USB stick that I have here with Windows 10 OS (I don't know if it has a virus). and immediately after restarting the pc in installation mode, I delete all partitions and their files from the HD and SSD in order to leave both without files, despite having 2 partitions that when formatted are never 100% free of files, something in between 40 mb. after that I choose the w10 to be installed on the sdd, and use the formatted hd to install my programs and games.
Additional question: regarding modem problems, I will change my internet to an optical fiber one this week, so I will change internet operator and consequently modem, would this possibly solve the problem over "modem" that you mentioned?
Thank you for help