Display disappear after install new graphics driver!!!

Today, I was prompted by ubuntu 8.10 to install NVIDIA accelerated graphics driver. I accept by pressing Activate to download and install the updated graphics driver and restart. But the display disappear after re-boot. May be my machine is too old and not supported by the new driver!

Here is how I recover to original setting:
- Re-boot the machine, and press 'ESC' to enter menu while GRUB loading.
- Enter Recovery Mode by selecting "Ubuntu 8.10, Kernel 2.6.27-7-generic (recovery mode)"


- Select "xfix Try to fix X sserver" in Recovery Menu.


- After some process, the screen will return to Recovery Menu.


- Now, you can select "resume Resume normal boot". The normal display resumed:)