How to force a resolution on Windows 7

I have a machine with Windows 7 x64 and 2 screens.

Both Samsung,

a SyncMaster 2443NW (max 1920x1200) and a SyncMaster 2032MW (max 1680x1050)

Problem is that the 2032MW on Windows 7 one only gives this ranges:

And the 24'' monitor, only gives a maximum of 1600x1200 !

I tried installing the Samsung drivers but they do nothing, the Graphic card is capable of such resolutions as it's an NVidia GeForce 9800 GT with 1024Mb Ram

on my MacBook Pro I have no problems in showing this as there is a nice application called SwitchResX that I can set any resolution.

What can I do in my Windows 7 machine?

Check the NVIDIA Control Panel, you should be able to add a custom resolution and enable it from there.

In Device Manager, try manually installing a driver for your monitor. Right-click Computer, then click Manage. Expand Monitors, then right-click your monitor and click "Update driver software...". Click "Browse my computer", then "Pick from a list". Uncheck "Show compatible hardware" and select the "Digital Flat Panel" for your monitor.