You're thinking about upgrading your Windows 8.1 computer to Windows 10. Which of the following is NOT required before upgrading?

To solve issues with OS files, you would reinstall the identical version over the old one to refresh an OS (operating system). When upgrading a system to a new operating system, you do not need to do this. When doing an upgrade, various factors must be considered. Backups must be created in the event that something goes wrong. Before you begin the upgrade, be sure that the applications you use are compatible with the new operating system and that compatible drivers for your hardware are available. You'll also want to make sure that the hardware you have is compatible with the new operating system.