Hi!! There it is in a nutshell: to set up a dual-boot machine, you should install the older Windows (Windows XP) OS before installing Windows Vista. Also, note that the edition of Windows Vista is irrelevant when you're setting up a dual-boot environment. Explanation: When you install an earlier version of Windows XP, after installing Vista first. In this case, you'll find that Vista no longer starts. Only the earlier version of the Windows system starts. When you install a second instance of Windows XP on a computer where you have already configured a Windows XP-Windows Vista dual-boot configuration. If this is the case, you may receive a "Disk read error has occurred" message. Why would you run into either of these issues ? It's all about the new way that Windows Vista uses Boot Configuration Data (BCD) to boot up rather than a boot.ini file, as was the case with Windows XP. In other words, the new boot-up procedure is incompatible with the old. When you install Windows XP onto a computer that's already running Vista, the XP setup procedure overwrites everything from the existing Master Boot Record (MBR), boot sector, and the boot files. What's the big deal? The big deal is that this old boot configuration method is unable to locate or load anything related to Windows Vista. It's as if the original Windows Vista is gone. Celestra

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Celestra