Article ID: 896455 - View products that this article applies to.
After you install an x64-based version of Microsoft Windows on a computer that also has a 32-bit version of Windows installed, you may experience the following symptoms:
These issues occur if you install an x64-based version of Windows on the same partition as your 32-bit version of Windows. Dual-boot environments are not supported if the 32-bit version of Windows and the x64-based version of Windows are installed on the same partition.
To resolve these issues, reinstall the x64-based version of Windows and the 32-bit version of Windows on separate partitions. Make sure that you back up all important data before you do this.
Dual-boot configurations that include an x64-based version of Windows and a 32-bit version of Windows are fully supported by Microsoft. However these operating systems must reside on separate drive partitions. In a dual-boot environment, you can run 16-bit programs on a 32-bit version of Windows. The 32-bit version of Windows also provides support for programs that use a 16-bit Setup program. However, programs that use a 16-bit Setup program are not supported in x64-based versions of Windows.
When you try to install an x64-based version of Windows on a partition that already contains a 32-bit version of Windows, the following warning appears in the text-mode Setup program: If you want to set up a dual-boot system, use the following best practices:
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:
http://www.microsoft.com/windowsxp/64bit/default.mspxFor product information about Microsoft Windows Server 2003 x64 editions, visit the following Microsoft Web site:
Article ID: 896455 - Last Review: October 11, 2007 - Revision: 3.6