Tady tomu to funguje (a má stejnou verzi driverů):
I upgraded the nVIDIA Windows XP Driver to Version 93.71 [061102], and all works fine...
The 1680X1050 resolution option is now available pickable from the new nVIADA TaskBar icon [very user friendly].
http://forums.nvidia.com/index.php?showtopic=69289
Další možnost je utilita PowerStrip, kde si lze nadefinovat vlastní rozlišení.