I have a Dell Inspiron N5050 laptop. Windows 7. When opening computer a screen popped up. Free upgrade to Windows 10. I accepted. Once downloaded I am unable to log on. On for a brief moment I see two options F2 or F12. Then screen goes blank. Unable to do anything. I have misplaced/lost my original operating disks, etc. All I have is a dead laptop. Any suggestions. If so, I need simple step by step instructions. I am not a computer geek. Thanks for any advice.