video resolution problem

[BBBB]

The display resolution properties are locked at 640 X 480, 60 Hz

My 3D capability seems to have gone away too.

I am using an ATI Rage 128 card with 32M

Is there a way to reinstall the driver or any other suggestions?

The driver was installed from the original Ubuntu disk and was not a special
ATI driver.
It seemed to be working fine for a while.

Thanks,
Bradley