How to remove old OS and Windows 10 Install files after upgrading

After upgrading to Windows 10 a considerable amount of hard disk space will be taken up by the Windows 10 installer and previous OS files – around 14GB even upgrading from a clean Windows 7 SP1 install!

To remove these is simple using this guide and Disk Clean-up.

httpvh://www.youtube.com/watch?v=8h9sNBb75CQ