SE198WFP Flat Panel Monitor - Display Problems

I Just got the SE198WFP Flat Panel Monitor.

It's connected to my Dell Dimension 4600 tower.

The monitor works, however the display looks like it's streched out horizontally and some of the text is blurry.  The images are perfectly clear though (just stretched out).

I know I need to use the 1440 x 900 resolution, however the driver I have doesn't offer that.  I downloaded the lastest Nvidia driver and it gave more options for screen resolutions, but still doesn't offer 1440x900.  Can someone point me into the direction of a driver that does? Or is there another way to fix this problem?