I get lots of messed up text and what I can only describe as deeply etched black lines criss-crossing the screen in various places. (it's a weird effect) with a Geforce3 unless I force one of the antialiasing options in the control panel. The Quincunx mode seems to produce the best results; I don't know if the GF2 supports this, but all of the antialiasing options help significantly for the text issue. This is on Windows ME.
As for the flashes, I have never really heard of that; someone else might be able to help you there.
[This message has been edited by CP5670 (edited 02-02-2002).]