How well could I run Starcraft II and Civilization V

How well could I run them? Here are my specs:

CPU: Intel(R) Core(TM) 2 Duo CPU E7400 @ 2.80 GHz

CPU Speed: 2.80 GHz Performance Rated at 5.04 GHz

RAM: 3.5 GB

OS: Microsoft Windows XP Professional Service Pack 3 (build 2600)

Video Card: GeForce 9500 GT

DirectX version: 9.0c

Sound Card: Realtek High Definition Audio

Your GPU sucks hard, the rest is fine.

I would say a mix of low/medium for SC2, don't know about Civ 5 as I don't have played it.

Civ V minimum GPU requirement is an ATI HD2600 XT 256MB, which I think is a bit slower than your card so I suppose you can run it on minimum settings.