Dave:

I'm not much of a wiz when it comes to PC's or their software, but you might try this.

If you know the task number, click START, then SEARCH, then point to your CDRom and provide the task number or a portion of it in the SEARCH field. See if you can move around using this approach.

I had all sorts of trouble with the ShockWave software that accompanied the CDRom and I've found tasks using the approach above that aren't presented when using the menu approach(Acro and Shockwave).