I have been seeing the memory in my system slowly approach close to 4GB while my Resource Monitory only has about 1GB in use as part of the “Working Set” I then saw a note that talked about the video drivers and I started to connect the two.
It seems that the NVIDIA driver for my Dell E6400 is slowly leaking RAM until eventually Windows just runs of of free memory. To fix this, I just re-installed the existing driver. When the computer screen flashes and the driver reloads, my memory is now down to a manageable 1+GB.
The current driver I am using in my DELL is NVIDIA Quadro NVS 160M is 18.104.22.16862, (NVIDIA195.62) with a date of 11/20/2009.