If you have an on-board GPU and a desktop GPU built into your PC, them World Creator might use the on-board GPU instead of the way more powerful desktop GPU. In such a case, World Creator might not start properly or run extremely slow on your computer.
In such a case, we highly recommend you to adjust your setup that when running World Creator, your PC uses the desktop GPU instead. To do so, follow any of the two links below to see, how to switch from on-board to desktop GPU: