I'd say go with a different video card. Your system is decent for what you're doing (Dual boxing).

Lucky for you, ATI has some rather inexpensive cards.
http://www.newegg.com/Product/Produc...82E16814125258 4850@129.99
Or try Nvidia http://www.newegg.com/Product/Produc...82E16814187074 260@169.99