Q. How can I configure my pagefile size to be "system managed" for Windows XP and later versions?

A. You can specify pagefile location and size by modifying the PagingFiles value under the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management registry subkey. If you want the system to manage pagefile size, simply set the initial and maximum pagefile sizes to 0, as the following example shows:

C:\pagefile.sys 0 0 

You must reboot the machine for the change to take effect.