I'm seriously about done trying to fix this issue on my computer. I run a Windows 8.1 Operating System on a Probook 455 G1. Im having issues with my Update and Recovery. When I try to go under recovery and either select "Refresh your PC without affecting your files" or "Remove everything and reinstall Windows", it will always tell me "Insert Media: Some files are missing. Your Windows Installation or recovery media will provide these files". I have the "Application and Driver Recovery DVD" and "Operating System DVD" for both Windows 8 and Windows 7. Now however, in order to Refresh my PC and run recovery, I have to have the "Operating System DVD" or "Application and Driver Recovery DVD" for Windows 8.1 now that I have upgraded. I obviously just upgraded to Windows 8.1 from Windows 8 for free at home. Also, apperantly it is impossible to return to Windows 7 or 8 without a factory reset or PC refresh (which is what I'm trying to do in the first place). I know I could possibly download the Windows 8.1 Operating System onto a blank disk and use it, but to do that I would need a Windows 8.1 product key (which I don't have). Would I have to just buy Windows 8.1 to get a product key and try this? Does anyone have a much more simple solution for me??