LinuxQuestions.org - ubuntu nvidia problem

hi everybody...
I've just installed feisty on my pc which has an nvidia 7900GS card.
When I first loaded ubuntu live from the cd i could only see the top half of the screen twice!!!(same thing up and down). Anyway, I installed and X wouldn't start. following advise found on the internet i did sudo apt-get install nvidia-glx nvidia-kernel-common and then sudo nvidia-glx-config enable. X started but the whole screen is blury (as if I suddenly need glasses), there are white lines over the menu bar as if i have a tv with not a good signal and the opion "enable desktop effects" on system-preferences all it does is to make my boarders disappear.

Below is part of my xorg.conf if it can help:

Section "Module"
Load "i2c"
Load "bitmap"
Load "ddc"
Load "extmod"
Load "freetype"
Load "glx"
Load "int10"
Load "vbe"
EndSection

[..]

Section "Monitor"
Identifier "Generic Monitor"
HorizSync 28.0 - 51.0
VertRefresh 43.0 - 60.0
Option "DPMS"
EndSection

Section "Device"
Identifier "Generic Video Card"
Driver "nvidia"
EndSection

Section "Screen"
Identifier "Default Screen"
Device "Generic Video Card"
Monitor "Generic Monitor"
DefaultDepth 24
Option "AddARGBGLXVisuals" "True"
SubSection "Display"
Depth 1
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 4
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 8
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 15
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 16
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 24
Modes "1024x768" "800x600" "640x480"
EndSubSection
EndSection

Section "Extensions"
Option "Composite" "Enable"
EndSection