Problem with ATI Radeon card

See the following articles (Integrated ATI Raedon 9600 GPU card is used by Akhil-da) :

See it once :
http://xorg.freedesktop.org/releases/X11R6.7.0/doc/radeon.4.html

May be a helpful one :
https://help.ubuntu.com/community/BinaryDriverHowto/ATI

Look at this too, if unsuccessful, and post the problem with proper details to :
http://www.ubuntuforums.org/showthread.php?t=221320&highlight=screen+fonts