Resetting screen resolution in Gutsy

[Nigel Ridley]

I did a clean install on my daughter's P111 with a Gforce2 card - so 
installed the nvidia glx drivers and now on a restart the resolution is 
stuck on a maximum of 600x800.
I did try:
sudo dpkg-reconfigure -phigh xserver.org
but I get an error message 'xserver.org not installed'

What's the command to reconfigure my xorg.conf ?

Blessings,

Nigel

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