QuickTime 7 is supported on Mac OS X (10.3.9 or later), Microsoft Windows 2000, Windows XP Home Edition, and Windows XP Professional.
QuickTime 7 is not supported on Windows XP Professional x64 Edition.
301301: "iTunes for Windows not currently supported with Windows XP Professional x64 Edition"
Important: Information about products not manufactured by Apple is provided for information purposes only and does not constitute Apple's recommendation or endorsement. Please contact the vendor for additional information.