New installation - cannot increase the screen resolution

Hi,    

  I just installed Debian using DVD set from CheapBytes   into a new HP Pavilion Slimline s3020n desktop. It has   Nvidia GeForce 6150LE graphics adaptor driving 1280x1024   resolution.    

  Thrying to increase the screen resolution using the Screen   resoultion preference tool, however, I cannot find any extra   resolution option in the menu - only the basic resolution of   640x480 is available. The Samsung 19inch LCD screen can   display 1280x1024 - how can I increase it ?    

  Thanks for your help in advance,    

  Chan

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