There is a more comprehensive way to clear space on a fresh installation of Windows, which also removes the Windows.old folder.
In Windows 8, press Windows Key + S to get search. Then type "disk cleanup," and click on the option that comes up to free space by removing files from the computer. Select your drive. Let is scan, then click the button with the shield to redo the scan as an administrator. Once it finishes, check every box. It will delete all old Windows installations in addition to a bunch of other crap you don't need on a fresh installation of Windows. The utility will look like this: (click the picture to get to the official Microsoft instructions)...