I would follow what kimsland is saying, but just wanted to add that my experience with these cards has only shown a few things to work, and they didn't work for everyone. The main problem seems to be that the newer drivers don't support AGP 100% and that the older driver don't work on this series of cards.
One person had to go into BIOS and adjust the AGP aperture.
One person had to contact the manufacturer Sapphire (not ATI) for drivers and hotfixes.
If a CD came with it I would follow the basic remove/install instructions for ATI cards which I will post below. I wouldn't recommend using the drivers from their site though if you have the install CD
1. Click on Start, then Control Panel, then go to Add/Remove Programs.
2. At the top of the list you should see several ATI entries. Select the entry entitled ATI Software Uninstall Utility, and click Change/Remove.Also do the same for Nvidia if there
3. You will be prompted to restart your system once the uninstall is complete.
4. Once restarted, check the Add/Remove Programs list again for any remaining ATI software or other drivers that you have tried.
5. If any ATI software is still listed, click Change/Remove on those entries to uninstall each one individually.
6. Next, please scroll through the list until you find an entry called DAO (IF there use step 7)
7. Select DAO, then Click Change/Remove to uninstall this program.
8. Insert your Driver CD it should autorun
9. Follow on screen instructions.
If you dont have a Driver CD:
1.Go to link and put in your OS and select your card from the list, hit GO.
http://ati.amd.com/support/drivers
2. Click Next on the first install screen.
3. Click Yes to the License agreement.
4. Click the Custom button.
5. Select the driver, catalyst control center (if wanted) and uncheck the box for steam
# The installer will start to load the display driver first.
Next you will see the WDM Capture drivers load (for VIVO or All-In-Wonder).
The Catalyst Control Center setup will start shortly after.(if selected)
A dialog box will indicate the install progress.
6.Click Finish to restart your computer.
Your not done, ->Follow below.
7.Go to Control Panel-> add hardware => have disk
8.Select the Driver location yourself which should be C:\ATI\Driver Folder\Driver