I upgraded to Ubuntu 10.10, but the GUI interface fails to start when the computer boots. Instead I get a command line prompt, when I log in and type 'startx' I get the following (copied from the Xorg log):

[ 269.667] (WW) Falling back to old probe method for v4l
[ 269.667] (--) NV: Found NVIDIA GeForce Go 7900 GTX at 01@00:00:0
[ 269.668] (EE) NV: Kernel modesetting driver in use, refusing to load
[ 269.668] (EE) No devices detected.
[ 269.668]
Fatal server error:
[ 269.668] no screens found
[ 269.668]
Please consult the The X.Org Foundation support
at http://wiki.x.org
for help.
[ 269.668] Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[ 269.668]
Is there a way to fix this?