I'm not a 100% sure on this one but if you have saved a new profile, the location should be C:\Documents and Settings\*USERNAME*\Local Settings\Application Data\wanted
I'm not sure but it could be under My Documents as well. When you find this folder it should have 2 sub folders called 'Data' & 'Saves'. Under 'Data' folder you'll have a file called 'renderer_settings.xml', open it in notepad & look for the resolution part. For me it looks something like this "resolution="1280 1024" refresh_rate="75"
Just edit that, save & then try to run the game.