Windows 10: Windows 10

I changed the config from 1 to a 4 I believe in an area called processors recommended by a friend to make the computer faster. My pc is old originally windows 7 upgrade to 10. After this change it will not reboot. I’ve tried to reinstall 10 but won’t install without a product key which I don’t have. I don’t think it has the capacity for 11 but I have a new laptop with 11 on it. The only reason I need to get back in is I thought I had everything upload to google cloud but once I go there something like a photo will show the title of the photo file but nothing is there. Any ideas??

:)