Good evening.
This request for help can be considered resolved, because I have run the sfc /scannow test again and it came out correct. I had previously run several tests and the error always came up.

I don't know if it's related, but last night I turned off the PC and when I turned it on this afternoon it did some Windows updates and also gave me a warning from Panda IS application protection about wanting to run "playstv_patch.exe" and asked me what to do. As I had no idea, I looked it up on the Internet and found 4 lines that talked about malware, so I denied the execution and also removed this executable from where it was "users/app/….local/temp".
After all this, I ran the test again and it came out fine.

So tomorrow I will try to install the darn printer again to see what happens.
Best regards.