You have a builtin crappy intel card..If your display can do 1280x960 (or 1280x1024) that should work well.
Well have you tried running it without any mods ? does it still run slow ?You could also try a old version of Aali's Driver and see if that makes any difference, try just going back 1 version or so and see if the game plays any faster.
well have you tried using the Low Res of the Avalanche overhall, you are using the high res patch correct ? The high res patch is ment for computers that run in alot higher res then what your running at and that may be the cause of the slow down.