If you installed the demo and the full version, you should see the six board sets included with the demo (where each set is 4 boards long) and the six sets included with Board Pack #1 (where each set is 25 boards long).
This usually occurs if you install Board Pack #1 in a non-default location (like "C:\Games\LDA Games\DX-Ball 2" instead of "C:\Program Files\LDA Games\DX-Ball 2", or on the D drive instead of the C drive) and then run the shortcut that the demo created. It will find your boards if:
* You run the shortcut created by Board Pack #1 instead of the shortcut created by the demo
* You install Board Pack #1 in the default location.
If you can't get it to work, the easiest thing to do is simply to uninstall both versions and reinstall Board Pack #1.
Let me know if I can help you with anything else.