I started Ultima VI but I want to start over. I tried creating a new character, but after I answered all the morality questions it said a game was already underway and I needed to run the install program on a disk? What do I need to do? What install program? I tried the DOS settings that appear when I hit Play from Gogh, but it asked a bunch of hardware DOS questions I didn't know how to answer.

Hello,
Just run the installer from GOG again. That should put it back into the initial state. You might have to delete the folder first. Another option is to just go into the savegame folder and delete its content.

I uninstalled it, then checked the box to delete all local saves. Then I downloaded the game again but turned cloud saves off (if you don't know how to do that, just disconnect from the internet. Same effect). Open up the game again, and you'll have no save game on your computer, and GOG won't download your cloud saves.

Lets you create a new game.

Once you've done that, save your new game and turn cloud save back on. It'll overwrite the cloud save with the more recent one on your machine.