This is an excellent article on virtual memory and optimization done by a colleague
http://www.petri.co.il/pagefile_optimization.htm
Clear Pagefile on System Shutdown
As an added security precaution it is possible to clear all data that has been written to the page file so it cannot be retrieved. The downside to this tweak is that it may substantially increase shutdown time depending on the amount of data in the page file.
Read Microsoft KB Article Q314834 on Clearing Paging File at Shutdown
[Start] [Run] [Regedit]
Registry Key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management
Modify/Create the Value Data Type(s) and Value Name(s) as detailed below.
Data Type: REG_DWORD [Dword Value] // Value Name: ClearPageFileAtShutdown
Setting for Value Data: [0 = Clear Page File Disabled / 1 = Clear Page File Enabled]
Exit Registry and Reboot
Get a free optimizer here:
http://www.sysinternals.com/