Microsoft KB Archive/182086

= How to Clear the Windows Paging File at Shutdown =

Article ID: 182086

Article Last Modified on 2/27/2007

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APPLIES TO


 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Professional Edition
 * Microsoft Windows 2000 Datacenter Server
 * Microsoft Windows NT Server 4.0 Enterprise Edition
 * Microsoft Windows NT Workstation 3.51
 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Server 3.51
 * Microsoft Windows NT Server 4.0 Standard Edition

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This article was previously published under Q182086



For a Microsoft Windows XP version of this article, see 314834.



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



SUMMARY
This article documents the method for clearing the Windows paging file (Pagefile.sys) during the shutdown process, so that no unsecured data is contained in the paging file when the shutdown process is complete.

Some third-party programs may temporarily store unencrypted (plain-text) passwords or other sensitive information in memory. Because of Windows virtual memory architecture, this information may be present in the paging file.

Although clearing the paging file is not a suitable substitute for physical security of a computer, you may want to increase the security of data on a computer while Windows is not running.



MORE INFORMATION
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.  Start Registry Editor. Change the data value of the ClearPageFileAtShutdown value in the following registry key to a value of 1:

If the value does not exist, add the following value:

Value Name: ClearPageFileAtShutdown

Value Type: REG_DWORD

Value: 1

 Restart your computer for the change to take effect.

Note: When you enable this registry change, your computer may take more time to shut down. For additional information about Session Manager memory management settings, click the article number below to view the article in the Microsoft Knowledge Base:

102985 REG: CurrentControlSet Entries PART 2: SessionManager

Additional query words: erase delete zero null wipe

Keywords: kbenv kbhowto KB182086

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