I upgraded a laptop to windows 10. First off it had vista, when I got it, it was already upgraded to windows 8 before I upgraded it to windows 10. Now Im having issues and i am told I need to update the Bios but, will have to roll it back to vista before doing so... How do I do this when recovery will not let me do it. The laptop is an old (HP Pavilion dv6747cl) I really need to know how to get it back to Vista. Please Help.....