I don't understand the numbers on graphics cards. I have an ATI Radeon 3100 - is that any good? 3G of RAM, dual core 2.1ghz. Ran Civ4 perfectly fine, but I have to dial things down for mods like Quot Capita.
Would it also help if I installed Vista 64bit? It's currently on 32, but can be upgraded (or so the shop guy told me).
That appears to be an embedded chip, not a graphics card and around the minimum requirements performance wise (not really sure on the latter).
http://www.notebookcheck.net/ATI-Radeon-HD-3100.20165.0.html