How to load 2 different operating systems to one pc?

install Windows 7 and then install Windows 10 second. 2nd partition that's simple 

we can use VMWare player to have multiple OS

Computers normally have a single operating system installed on them, but you can dual-boot multiple operating systems. You can have two (or more) versions of Windows installed side-by-side on the same PC and choose between them at boot time.

Typically, you should install the newer operating system last. For example, if you want to dual-boot Windows 7 and 10, install Windows 7 and then install Windows 10 second. However, this may not always be necessary — installing Windows 7 after Windows 8 or 8.1 seems to work.

The Basics

The process for creating a dual-boot system is similar no matter what operating system you’re dual-booting with. Here’s what you’ll need to do:

• Install the First Version of Windows: If you already have a single Windows system installed on your computer, that’s fine. If not, install Windows normally. You may want to use custom partitioning settings and leave free space available on your hard drive for the second version of Windows.
• Make Room For the Second Version of Windows: You’ll need available hard drive space for the next version of Windows. If you have Windows installed, you can resize the partition. You could also insert a second hard drive into your computer (if it’s a desktop computer) and install the second version of Windows to that hard drive.
• Install the Second Version of Windows: Next, you’ll install the second version of Windows. Ensure you choose the “Custom Install” option, not the “Upgrade” option. Install it alongside the previous version of Windows, in a different partition on the same disk or on a different physical disk.

You’ll then be able to choose which copy of Windows you want to boot at boot time, and you can access the files from each version of Windows on the other one.

you can either use a virtual machine (Vmware , Virtualbox..) or you can use dual boot( linux you need grub partition a swap partition and a boot partition)

easy..there is tools u can use:

1- Hyper-V From Microsoft

2- VMware From Dell

3- V-box From Oracle

every tool has different options but the base is same

i used all and for me the best is Hyper-V 

Methode 1) Use Dual booting with help of using normal bootup.

Methode 2) use virtualization help of VM ware, oracle virtual box etc  . Methode 2 is most reliable)  

By install vmware programing in master operating system and install another operating system