Hey guys-My brother's hard disk went out on his Dell so I'm installing an older 45 gig IBM of mine for him. I took his out, put mine in, and booted up. I was prompted to install a boot disk, so I ...

EDIT: It did - changing that setting back to "AHCI" resulted in a, "This operating system failed to start", message when I tried to boot XP. Changing the BIOS back to the "IDE" setting didn't fix ...

In most cases, this happens when you install Windows Vista or later operating systems alongside older operating systems. For example, Windows XP used Boot.ini, and since Windows Vista, it was BCD ...