How To Upgrade Windows 7/8.1 to Windows 10 (FOR FREE)
Windows 10 FAQ: http://www.microsoft.com/en-us/windows/windows-10-faq
NOTE: You need to have SP1 installed on Windows 7 in order to upgrade to Windows 10 using the Windows Update method shown in this video. If you are upgrading from Windows 8.1 some apps may not be supported yet on Windows 10. And most importantly as this is not a RTM release yet (release to manufacturing) it is not advised to install this on work or productive computers as there can be unexpected bugs and compatibility issues.
Processor : 1GHz or faster with support for PAE, NX, and SSE2
RAM : 1GB (32-bit) or 2GB (64-bit)
Hard disk space : 16GB
Graphics card : Microsoft DirectX 9 graphics device with WDDM driver
Product key: 6P99N-YF42M-TPGBG-9VMJP-YKHCF