A few months ago I got a virus that prevented Windows 10 from booting and also prevented me from using windows recover environment (it just showed a black screen instead of going to windows RE). I thought that I had fixed it by just reinstalling windows without cleaning both my hard drive and my SSD. My computer then did the same thing about 2 weeks later. I then used the clean command in diskpart and reinstalled windows 10. After I had reinstalled Windows 10, I found that windows update was saying that updates were failing and that I needed to try again later. I finally managed to get it to the latest version of Windows 10 by downloading and installing it from online. I am now paranoid that the virus still exists on my drives and I would like to know if that is possible and how to make sure that it isn't there. I have been using Kaspersky, Malwarebytes, CCleaner, Adwcleaner, RKill, and KVRT. They all have said that everything is safe but I am still very paranoid. Thanks!