Display resolution problem, Inspiron 8600

I just rebuilt my Inspiron 8600 and upon installing the updated ATI driver I had 1600x1080 or something close to that . I then went and downloaded MS Cleartype tuner and setup cleartype. During that process I changed the resolution to 1280x1024. After rebooting I decided I wanted to go back to the 1600 resolution. It's no longer available. I've turned of cleartype and reinstalled the ATI driver. No dice. I even got a message after the reinstall that I'm not running at the optimal resolution. I CANT change it!

Please advise,

Bryan