ubuntu

I haven't figured out what's the problem with the display.
It makes me feel really dizzy.
I've tried several methods, but in vain. Moreover, it's getting worse.
For example, I re-installed the NVIDIA driver, both graphically and manually with more than one version. I changed the xorg.conf, it didn't work as well.
I decided to reinstall. Hope it can fix all the problem.

Operation System: ubumtu 9.10
video card: GeForce 8400 GS
monitor: CHIMEI 22QA

While I was going to post the picture of the screen. I used the screen shot. It looks like this.