I installed Windows 8 a little while ago and now I want to install windows 7 again, I did a restore in windows 8 itself under an option in the settings to remove all files, settings etc. It then went through hours of doing that to eventually telling me that it failed to restore and then made me restart. When the pc started up I got the following "Press any key to boot from cd or dvd an operating system wasnt found try disconnecting any drives that dont contain an operating system" .. I tried to insert the windows 8 disk I used to install in the first place and that didnt boot up and then I tried the windows 7 disk and still wont boot up, nothing happens when I get to the press any key screen. Ive entered the BIOS settings and changed the boot order to the dvd being number 1 and disabling the hard drive and still no luck. Ive seemed to have tried everything and im out of ideas. Hope someone can help me.