Backup the whole Video key in case you need to revert back.
You'll know you found it when it has a ton of info, including info for various resolutions and refresh rates. Look for the 00 keys containing your video card.
With the CCC software failing to launch I figured my next step would be to edit the Registry. I did find a supposedly compatible Windows 8 driver and it installed, but launching CCC did nothing. Unfortunately, AMD video driver support for legacy video products isn't so great, especially for Windows 8. On Windows 7, you simply install AMD/ATI's Catalyst Control Center (CCC) and then you can launch CCC and change the underscan/overscan settings to fill your whole screen. The specific computer I'm using is a Dell Zino HD with a ATI / AMD 4330 video card, which was running Windows 7, but I upgraded to Windows 8 and which was when the problems began. Who wants to watch 1920x1080 (1080p) HD video content with black borders? Well, after some extensive researching I was able to resolve the issue. I had a problem with Windows 8 having underscan (& overscan) issue where the screen was not filling entire TV screen over a HDMI connection, resulting in abnormally large black borders.
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