After upgrading my Compaq Presario SR5139UK with GeForce 8400GS and a generic 19" LCD monitor from Vista to W7 I am unable get the full resolution on the monitor. In control panel the monitor is shown as a 17" and gives no option to select a 19". The max resolution that I can get is 1152 * 764 rather than the previous 1440 * 900 under Vista. I have updated the NVIDIA driver to 191.07 but with no success. Any ideas please?