Weird Windows Resolution problem

My resolution is stuck at 800x600 while under the setting it says its "1900x1200" Now keep in mind that I am an I.T guy myself so that this is not a normal driver problem. Please advise. Thank you!

edit: it happened after i opened a PDF file. i have a 8500GT with the newest driver. Under the setting, it shows up as 8500GT.

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