Change OS from Windows 7 to Windows 8.

I do have a Windows 8 OS but i dont know how to install it to my laptop with Windows 7 OS. I find it difficult to do an upgrade because i am worried that my OS and computer files will be corrupted. Please enligthened me on how to change OS with ease and smooth installation. Thanks

This tutorial will help with the upgrade, be sure you have a key for the second computer. As usual back up your data files.

http://www.eightforums.com/tutorials/2234-upgrade-install-windows-8-windows-8-1-a.html