The ATI drivers from 2006 have had a few minor glitches. Repeated attempts to upgrade through Windows Update and through Windows Device Manager resulted in no available upgrades.
AMD (owner of ATI) has this page to upgrade to drivers from 2010.
The upgrade went smoothly.
After the upgrade I used Windows Device Manager to look for an additional upgrade. It found an "upgrade", which was a downgrade to the previous version from 2006.
This was cured by reinstalling the ATI upgrade.