My most frequent crash is on the pull of the first named, but we've only been in the zone for about 5 minutes at that point. Typically, I get the "complete freeze" (must End Task EQ2) more than the "Critical Error" in Nizara. Never completely freeze anywhere else and never Critical Error anywhere else either (except for iQuads when rearranging raids as leader).
Athlon64 3500, ATI X800 Pro VIVO 256MB, Windows 2000