ITT megascientifical knows nothing about computers
listen, dude, you aren't booting the system files on the other harddrive. it's dormant and files on the old harddrive only activate if you activate them
plug it into your new computer and run malwarebytes or something on the old harddrive and it will find any viruses and delete them
the only way you can get the virus (if there is one) is if you activate the .exe files that are the virus manually