Here is a guide to help you out on how to install Windows 10. However, the process to install and obtain could vary depending on the Operating system your computer is currently on.
So to help you out, here is a small guide.
Windows 10 is a free upgrade for Windows 7, Windows 8, and Windows 8.1 users, but people who are running older versions have to buy a copy.
In the start menu or start screen there will be an option called Open Windows Update. If your computer is eligible, you will see the option to upgrade to Windows 10.
Your computer will automatically begin to download the new updates and get you to the new OS. Always agree to all the terms and conditions by Microsoft.
If you are purchasing Windows 10 from a retailer then following this guide will help you:
Insert the Windows 10 disc or USB to the drive, then reboot your computer and as a normal boot preference select either USB or CD.
You have to press any key to continue and select next on the following screen, before clicking install and waiting. If you want to keep your existing OS and files then select the first option and if you want to replace your old Operating System with the new Windows 10 then select the custom option.
If you are going with the second option you need to install windows 10 in the existing partition. You will find the options on your screen. Click next when you are done.
The process of installation of Windows 10 could take from 20 minutes to half an hour, depending on the performance of your PC.
Microsoft will automatically download the latest update to your system and move you to the latest version of Windows 10, if you are using Windows 10 Developer preview.