Every single file on my pc suddenly read only.

Every single file on my pc turned read only suddenly, what could have caused it and how would i fix it?

Quote from 0kelvin

13 hours ago, 0kelvin said: Virus, or the file system itself changed some security setting.

Might be a virus as my pc now allows me to edit files that are: read only, dll, etc. It didn't allow it before.

Going to do factory restore after backuping.