Windows Vista allows you to use multiple operating systems.

If Windows Vista is installed as a dual boot with Windows XP, by default Vista would be set as the primary operating system.

However, if you frequently use Windows XP, you can set Windows XP as the default operating system by a simple command.

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Click "Start" and type "cmd" in the "Search" box.

Once the command prompt is displayed, simply type in th command "bcdedit /default and press "Enter".

Windows XP will now be set as your default operating system.