I think your performance setting are on the wrong values (assuming you have had a memory up grade).
This is the same task required for any windows computer that has ram added so I will describe the procedure in full.
For windows users performance settings should be set as follows.
Right click on my computer and select properties. Select Advanced tab then performance settings.
Look at the Recommended value and set the minimum and maximum page file values to that value.
There is no point setting the upper limit to a higher value because if you get an out of virtual memory error then either you do not have enough memory or you have an application problem.
This is described in the windows help files but to sum it up the help file say you can set virtual memory to any value but it's best to leave it on the recommended settings.
And that's why I use Linux
