The system is totally different. The download takes longer because you are basically downloading an OS installer that will overwrite the existing installation. A lot of programs are either are not running properly or have been removed from the previous Win 8 installation. Avast was gone. Logitech drivers screwed up. Video drivers screwed up. The imaging utility under Control Panel called "Windows 7 File Recovery" is gone and now under "File History". I'm sure there's a lot more. Nothing has changed. Still not liking it. Make sure to make a system image backup before installing the replacement OS.