[Pirate]

Graphics card should be in your future. Which one its up to you. Maybe stick in some more Memory also. Also make sure you check your power supply anything below 400W id look into something bigger.

yup, thats bang on. But it really depends on how much $$$ you want to spend. Seeing your specs it looks like you are running from onboard graphics - not good for gaming at all. Even with a modest graphics card you would see a huge improvement in gaming, and an extra 1gb of ram would always be nice.