While most PCs have a single operating system (OS) built-in, it’s also possible to run two operating systems on one computer at the same time. The process is known as dual-booting, and it allows users to switch between operating systems depending on the tasks and programs they’re working with.

Can I run Windows 7 and Windows 10 on the same computer?

You can dual boot both Windows 7 and 10, by installing Windows on different partitions.

Can I have 2 Windows 10 on my PC?

Physically yes you can, they have to be in different partitions but different drives is even better. Setup will ask you where to install the new copy and automatically create the boot menus to allow you to choose which one to boot from. However you will need to buy another license.