How to organize everything so that viruses do not migrate from the 2nd Windows to the first?

Question

Malware

Put the 2nd Windows on partition 2 of the hard drive. The main system (1st Windows) on ssd.
I plan on the 2nd Windows to test all sorts of potentially virus games.
Question: how to organize everything so that viruses do not migrate from the 2nd Windows to the first. For example, if you disable the ssd through the control panel, it does not work. There is a main boot. Can somehow encrypt the ssd .. Or how to make it invisible from the 2nd Windows?

Answer 1

Or?

Or a virtual machine with snapshots. We installed the game, launched it, checked it - if there are no viruses, install the game on the host, if there is, roll back the virtual machine to the previous snapshot.

Answer 2

Do not run files from other Windows disks, that's all.

Answer 3

Encrypt the first Windows (for example, using VeraCrypt).