The monitor usually has nothing to do with it. You can make sure you have "Default" or "Plug & Play" monitor selected, but it likely won't have any impact on your resolution settings.
Instead, you need to install the right driver for your video card (or motherboard integrated video). Right now, Windows is using a generic one for the adapter.
You can probably find one out on Dell's website, or search the net...
~cdogg
"Insanity: doing the same thing over and over again and expecting different results." - Albert Einstein
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