Error message when you try to upgrade a computer that is running Windows XP to Windows Vista: "The legacy OS does not meet the software update requirements: 'Service Pack 2 for Windows XP'"

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SYMPTOMS

When you try to upgrade a computer that is running Microsoft Windows XP to Windows Vista, you cannot select the Upgrade option. Also, you receive the following error message in the Install Windows dialog box:

Upgrade has been disabled

- The legacy OS does not meet the software update requirements: "Service Pack 2 for Windows XP"

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CAUSE

This problem occurs because Windows XP Service Pack 2 is not installed.

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RESOLUTION

To resolve this problem, follow these steps:

Exit the Windows Vista installation process.
Install Windows XP Service Pack 2. To do this, visit the following Windows Update site:
http://update.microsoft.com (http://update.microsoft.com)
Restart the Windows Vista installation process.

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