What if you don't really want to install two OS on your computer, but still need to an access to Linux from your Windows.
We can do that with special software such as VMware Workstation ( Player ) and with VirtualBox.
I highly recommend you to use VMware.
We can install any operating system in VMware and run it whenever we need.
In this post, I will show an example of Ubuntu.
1) First of all Download VMware Workstation ( non-free software but the player is totally free ) from its official website and install it on your computer.
2) Download installation file of Ubuntu operating system from its website.
3) Now open VMware workstation or player ( I'm using workstation ).
4) Press on Create a New Virtual Machine button.
5) In new window hit Next button, press on the Browse button and select installer disc image file (iso).
6) Enter your full name, username, password and hit Next button.
Also Read: How to install Ubuntu in VirtualBox
7) In this step, you need to choose the path to install the Operating system and give a name to it, hit Next button.
8) Now you need to set hard disk size, I will set it to 25 GB, press on Next button.
9) And at last, you need to press on the Customize Hardware button, change the memory size of the virtual machine. You can edit some settings too such as a processor, printer, display etc.
After configuration process, press the Close button, then press the Finish button.
Now it will run the operating system automatic installation process and after its finished, you can use Ubuntu virtual machine on your computer.