Horizontal Position off centered after auto adjust

I have a Dell E173FP LCD Monitor, which I have had for years without any trouble.  Today I went to press the power button, and pressed the (+) button by accident, and the screen went into auto adjust mode.  After it finished the screen was off center, with the left edge sitting in the middle of the screen.  I tried going into the OSD and changing the horizontal position, but even moving it all the way to 0, it is still not flush with the left side.  I tried auto adjusting again, but it still remains offset.  It only seems to be affecting the screen resolution of 1280x1024.  If I change to 1024x768 or 800x600 (and even the wide screen formats) it aligns properly.  Also this is the secondary monitor of my dual monitor setup.

Some specifics about my system:

Windows XP Pro SP3

AMD Athlon Dual Core Processor 4850e

ATI Radeon HD 4650

In the meantime I am running this monitor in 1024x768, but really want to get it back to 1280x1024 ASAP.  Please let me know what I can do.

Thanks,

Keith