go to
www.ati.com and download the newest drivers for your card and install them
if that does not fix the problem.. try
Open Display in Control Panel.
On the Appearance tab, click Effects.
In the Effects dialog box, select the Use the following method to smooth edges of screen fonts check box.
Click ClearType in the list.
if still same try using standard
well actually try this before reinstalling your driver....or installing a new driver... though it is good practice to udate your drivers