I had Dell studio 1536 laptop with windows vista defaults already installed. recently I decided to shift from Microsoft windows to ubuntu.
I installed Ubuntu gnome 3. After installation It's look like that everything is ok. but I found that ubuntu perform much more slowly than Vista!!!
I discovered that ubuntu uses an alternative driver for my Graphic card. Take a look to this:

Then i decided to download & install proper ATI (AMD) driver, from here.
My on-board graphic card is: ATI radeon HD 3200
THE QUESTION: IS IT IMPORTANT TO REMOVE PREVIOUS AMD DRIVER WHICH INSTALLED BY DEFAULT?
AND THEN WHAT IS ATICONFIG ? SAVE X WINDOW CONFIGURATION FILE? TAKE A LOOK TO THIS SCREEN SHOT:

any suggestion would become helpful