Use Bootsect to extract Vista or Windows 7 from a dual-boot configuration
Source: Greg Shultz
You can use the Bootsect command to remove the Windows Boot Manager and its Boot Configuration Data system from the boot partition of a hard drive and replace it with Windows XP's NTLDR boot management system. In this week's Windows Vista and Windows 7 Report, Greg Shultz shows you the Bootsect commands required to extract Windows Vista or Windows 7 beta from a dual boot configuration.
This download is also available as an entry in the TechRepublic Microsoft Windows Blog.