i recently bought a Hp ProBook 6570b with a windows 8 installed. May be its me but didnt like this operating system. I have been trying to downgrade it to windows 7 but failing. My issue is that when i go to bios through f10 select a boot order i cant seem to find a DVD drive option. Same case while i try to press F9 to choose a boot order, cd.dvd drive option is not available...please help me on this one..