I chatted with "Jeremy" again. He also recommended updating my Nvidia GeForce 6800 driver. (What I failed to mention above is when I started MyDVD from the start-up menu, a message was displayed saying that my video card driver may need an update, even though MyDVD started to run.) So, I installed the graphics driver and now EMC 9 Deluxe Suite seems to functioning fine. No clean uninstall/re-install was necessary -- at least at this point.
So far, I've successfully created a new project, added video, edited video, added chapters, and modified menus -- about 4-5 hours of work. There was one crash (when I changed the settings on one of the chapter buttons), but I had recently saved the project and was able to restore my work successfully. I found that frequent saves are a necessity with the earlier version of this product and probably is true with this version as well.
These are just preliminary results and I could still yet run into a problem serious enough to prevent finishing the DVD project. If I do, I'll let the forum know. When/if it happens, I'll probably resort to the clean install procedures. First, I'll probably update the Windows DirectX driver as I read somewhere else in this forum.
Thanks to all for the advice. I hope others are able to work through their installation issues as well.