How to Clear pagefiles.sys in Windows 7

How to Clear the Windows Paging File at Shutdown

Let me fix it myself

1. Start Registry Editor (Regedt32.exe).
2. Change the data value of the ClearPageFileAtShutdown value in the following registry key to a value of 1:
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management
   If the value does not exist, add the following value:
   Value Name: ClearPageFileAtShutdown
   Value Type: REG_DWORD
   

   Value: 1

   
   

   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management

   If the value does not exist, add the following value:Value Name: LargeSystemCache
   Value Type: REG_DWORD
   

   Value: 1

   
   

This change does not take effect until you restart the computer.

sumber: http://support.microsoft.com/kb/314834