I use a real cheap as chips card by NVIDIA a 7300GT to be exact. And Im using a dell 22inch wide monitor. Check the NVIDIA display settings, and go to the flat panel setting. You may just have missed a setting. my rez is fine no stretching or anything. I did have to load a driver specific to the monitor when I got it so the aspect ratio was correct for the wide screen, you may missed a driver for the monitor (not the card) too so check that too.

Jay