How to Disable the Prefetcher Component in Windows XP

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Article ID: 307498 - View products that this article applies to.
This article was previously published under Q307498
IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:
256986 Description of the Microsoft Windows Registry
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This article describes how to disable the Windows XP Prefetcher component. The Prefetcher component in Windows XP is part of the Memory Manager, and helps to shorten the amount of time it takes to start Windows and programs. You may want to disable this component for troubleshooting scenarios or in lab environments.


WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

To disable the Prefetcher component, use Registry Editor (Regedit.exe) to locate the EnablePrefetcher value under the following key in the registry:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\PrefetchParameters
Change the value of the EnablePrefetcher value to 0, and then quit Registry Editor. The next time you start your computer, the Prefetcher component will not start.


Article ID: 307498 - Last Review: March 29, 2007 - Revision: 1.2
  • Microsoft Windows XP Home Edition
  • Microsoft Windows XP Professional
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