I have the impression that a virus attack has occurred on my computer. How can you recover files after a virus attack? And how to protect yourself from such attacks in the future?

You can try to recover files from a virus-infected hard drive in two ways. The first solution is to use the command line, the second is specialized software. I think you better read about ways to recover files after virus attack. This is one of the best articles I have found on this topic. So after reading, write if this article helped you.