I just now got it to work. The website I bought an ebook from had another link to download Shockwave. The install prompt was hidden in another window, and when I closed it about 10 downloads simultaneously completed. I still had issues getting the file to show up properly in Digital Editions, but was able to get it to work by adding the book to the library from DE instead of just clicking on the book file itself. Thanks anyway for the help, Pat.