You can just download the graphics driver.(The choice is yours)
Go to the ATI site
www.ati.com click on Drivers&Software
Choose your operating system, what driver you need e.g Graphics
Then choose which class your graphics card falls under.
I would recommend downloading the "Display Driver,Control Panel,WDM Capture driver" if you can. But it is around 20 MB so depending on your connection speed it could take a while to download.
If you are using a slow connection then you can just download the "Driver Only"