min 120gb ssd will speed up things, but for gaming you have a MASSIVELY underpowered graphics card.
The single most important thing for you to replace is the graphics card. Depending on what budget you have available I would recommend an hd 7770, then 7850, then gtx 660Ti (from cheapest to most expensive).
__________________ Desktop: X3 710, 4GB DDR2 1066, MSI Cyclone GTX 460, Seasonic S12II 500W
Away from home light Gamer: Acer Aspire 15.6", A8-3500m, 4GB 1333
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