Windows 10 is one of the best operating system Microsoft has ever released. You can upgrade your computer (PC, Laptop, or Tablet) that is running Windows 7 or Windows 8/8.1 for free. Yes, Windows 10 is absolutely free. You must have a genuine copy of Windows installed on your computer.
Download Windows 10
You can download Windows 10 here
https://www.microsoft.com/en-us/software-download/windows10
What is minimum requirements to install Windows 10
You need an Internet connection
Minimum hardware required for Windows 10
Processor: 1 gigahertz (GHz) or faster
RAM: 1 GB for 32-bit or 2 GB for 64-bit
Hard disk space: 16 GB for 32-bit OS 20 GB for 64-bit OS
Graphics card: DirectX 9 or later with WDDM 1.0 driver
Display: 800x600