Based on this, you're already at your max 2 GB of memory. If you want more RAM, buy a new laptop with that discount. You can get a few decent laptops under $1,000 that can game and most laptops come stock with 4 GB RAM nowadays.
Also, which AV are you using? I'd recommend AntiVir (or Avira) for lower system resource usage and for the free-factor.
*EDIT*: Oops. that links to the C710ED. I think they're pretty similar, but if you have your product number, go on their website and find the product specifications for your laptop. It'll let you know how much RAM you can handle.