Thanks, AntiZig, I'll do that.
HEXit, thanks again. I used the d3d9.dll file and it broke my "application profiles" program, so I couldn't run Skyrim (or Mass Effect)... so that option is out. I'll have to investigate the ini files and see what I can do.
Regarding StarCraft 2, yeah, it depends what you regard as adequate!
I get 30+ fps on mostly medium quality (but high-quality textures) and with mouse lag reduced, which I find is playable. Also, I'm in South Africa and can't afford a high-quality rig, so I have to make do.