Note The 32-bit version of Windows must be installed on a separate disk volume or separate physical hard disk to function correctly. If you install a 32-bit version of Windows and a 64-bit version of Windows on the same disk volume, your computer may stop responding.
For more information about dual-boot configurations with 64-bit versions of Windows, click the following article number to view the article in the Microsoft Knowledge Base:
Technical support for Windows x64 editionsYour hardware manufacturer provides technical support and assistance for Microsoft Windows x64 editions. Your hardware manufacturer provides support because a Windows x64 edition was included with your hardware. Your hardware manufacturer might have customized the Windows x64 edition installation with unique components. Unique components might include specific device drivers or might include optional settings to maximize the performance of the hardware. Microsoft will provide reasonable-effort assistance if you need technical help with your Windows x64 edition. However, you might have to contact your manufacturer directly. Your manufacturer is best qualified to support the software that your manufacturer installed on the hardware.
For product information about Microsoft Windows XP Professional x64 Edition, visit the following Microsoft Web site: