Hi, Trying to help a friend out with replacing her hard drive that went out in her ASUS D550C, model #Atheros/Ar58152. She never made a windows repair disk so all I have done is installed the new hard drive. How do I recover the Windows 8 OEM that was on this system? When the computer turns on it goes straight to the Bios screen. Is there any tools to do this for free? I am not great at this so please explain with detail. Thank you so much