How to perform a custom installation of Windows Vista on a computer that is running Windows XP

How to perform a custom installation of Windows Vista on a computer that is running Windows XP: "This article describes how to perform a custom installation of Windows Vista on a computer that is running Microsoft Windows XP.
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To install Windows Vista on a Windows XP-based computer, we recommend that you p...
To install Windows Vista on a Windows XP-based computer, we recommend that you perform an upgrade installation. We also recommend that you prepare the computer before you install Windows Vista. For more information about how to prepare for a Windows Vista installation, click the following article number to view the article in the Microsoft Knowledge Base:
931227 (http://support.microsoft.com/kb/931227/ ) How to prepare to install Windows Vista on a computer that is running Windows XP
To perform a custom installation of Windows Vista on a Windows XP-based computer, follow these steps.

Note During the installation process, you can click the left arrow in the upper-left corner of the Setup program window to go back to the earlier step. However, if the left arrow is disabled, you cannot go back to the earlier step. In this case, if you want to start the installation process from the beginning, click the X button in the upper-right corner of the of the Setup program window to cancel the installation.

1. Start"