Not really, the extra memory that is shown is from your HD Seeing as the game is using the CPU hard, switching to grab info from the HD takes the CPU away from the game. On top of that the Intel i3 chip is a weak 3d video chip. So couple that with and over worked CPU and your not going to be able to run much. The number you see in-game of memory used is just what the video is reporting, it's not a true representation of what it really is using.
Using a laptop for gaming isn't then best idea, unless the laptop is built for gaming. Laptops use smaller and weaker, and cheaper componets and just don't run as strong as desktops. In the game your best bet is to turn everything to the lowest setting possible, as well as clearing out the laptop to run the least amount of processes possible. (hit cntrl, alt, delete and click on the processes tab. The number in the lower left corner is how many you are running. The lower the better, under 25)