+ 0 Votes Dual Boot Issue with Vista & Older OS scottieb0623 6 years ago I ran into the same problem, and after reading all of the posts, MS bulletin, and suggestions for third party freeware, I have a much simpler solution.Put Vista disc in drive, reboot. Run the Repair option, then select startup. That fixes Vista. Next, boot to Vista Windows, insert XP CD, explore CD, copy NTDETECT & NTLDR to the root directory of the HD that XP is installed on. Works like a champ!