Thanks, that helps a lot.
The difference in quality with AA and AF on is amazing.
But I've just noticed a new problem: I have attached these settings to nVidia's "Silent Hunter III" game profile, which I assumed was loaded automatically when SH3 is loaded. But when I load SH3, it seems that it is picking up the global profile (ie no AA or AF etc) instead. Fixing it simply seems a matter of Alt-tabbing out of SH3 and Alt-tabbing back in again, but surely this should not be needed? Am I missing a step somewhere? Or doing something wrong? (91.47 drivers if it makes a difference)