The Windows 8.1 update has been quite problematic and Microsoft have not provided a valid means for a clean install with a Windows 8.0 upgrade license. Fortunately for the retail license (which is what you have for that model) I have however documented a workaround see:
http://philipyip.wordpress.com/download-windows-8-1-iso/
Follow the instructions and download a Windows 8.1 .iso. Use this to clean install, to do see Windows Reinstallation Guide/A Clean Install of Windows 8.1:
http://philipyip.wordpress.com/dell-community-forums/