Change the virtual memory settings. Take it of 'let
windows manage my virtual memory' and configure it
manually.
As a rule of thumb, the minimum should be set to 1 1/2
times your system ram and the maximum to at least double
that. But only if you have plenty of hard drive space
left. Virtual memory needs space to expand and shrink. If
you let your drive space get too low then the computer
will slow to a crawl.