After Windows 10 upgrading deleting previous windows installation

After successful upgraded from Windows 8 to Windows 10, everything is working fine, and found the C drive free space drastically reduced quite a lot, almost 20 plus GB, googled and followed the online instruction to delete the previous windows installation, the link is as http://www.tenforums.com/tutorials/2066-windows-old-folder-delete-windows-10-a.html The previous windows installation was stored in the folder “Windows.old” […]