Don't expect to do any modern gaming with it.The CPU is below decent, the GPU is pretty old as well.The highest I'd say you'd be able to run is probably Half-Life 2 on max settings.
L4D/2.
I highly doubt this
I ran it on Athlon 1.1GHz single core, with an inbuilt 6150.
at 640x480 and it was actually aliased.
I've run L4D2 on a laptop with an ATi Mobility Radeon 9700 with 64 MB of VRAM, 800x600.