Just saw this @ Xp-erience.org

This tool clears out your current data sets in RAM. Clearmem (clearmem.exe)?Forces pages out of physical memory and reduces the size of running processes? working sets to a minimum. When you run this tool, the system pauses because of excessive high-priority activity associated with trimming the working sets. To run this tool, your paging file must be at least as large as physical memory.

Download Clearmem - Microsoft Memory Tool - Free @ Xp-erience.org