Video driver problem on upgrade to Hardy

[Paolo]

Hello,

This morning I upgraded from 7.10 to 8.04 on a Dell Inspiron 9300. And I have a 
problem with the video driver (Radeon X300). It used to work OK on 7.10 with 
System > Preferences > Appearance set to "Normal".

The problem resembles what I read here:
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/203809
And at the bottom of that page it says:
"the issue is fixed by removing fglrx which didn't work where as the free driver 
did."

I am a fairly capable computer user, but new to Linux. And I don't know how to 
"remove fglrx" (nor put it back again, if it turns out to make things even worse!)

I would be grateful for any advice.

thanks, Paolo