4:3 rez appearing on a 16:10 monitor

Hello everyone, simple problem here but I can't get it reversed despite uninstalling and installing new drivers, resetting to factory settings ect.
The new monitor we have is a 23" LCD with native of 1680x1050 but for some reason the only options that Display Properties and Nvidia software give us are for 4:3 monitors (1600x1200). On top of that if we shrug our shoulders and set the resolution higher the monitor asks as if we are incredibly zoomed in so that we only see a portion of the desktop at a time and have to navigate via scrolling around the desktop by moving the mouse to the far edges.
Further details can be provided if I can think of anything.
Thank you.