Windows 8 install image recovery fail

Hi my friend has asked me to recover his Dell Inspiron One 2330 to factory settings but for some reason it fails to recover from the hidden partition, I've tried through pc settings in the right side charms menu but i get Error code: 80070490. Does anyone know why this is happening?.

Would i be able to get the product key with software like KeyFinder, download a legit version of windows 8 oem and reinstall via disk or usb stick?.

You can get Windows 8.1 install media here, Create installation media for Windows 8.1 - Windows Help. This media will read and use Windows 8.0 and 8.1 OEM keys. If you download the correct version it will read the key automatically and activate with it online automatically. You just have to know if the PC originally came with Core, Pro or the Single language version.

You don't need to know what the key is but if your curios, http://www.eightforums.com/tutorials/27129-product-key-find-windows-8-a.html
Also http://www.eightforums.com/tutorials/18309-windows-8-windows-8-1-iso-download-create.html

refer to this post > http://www.eightforums.com/installa...-8-1-refresh-back-windows-8-a.html#post469133