You're getting an error message from Adobe Reader, not Digital Editions.
The most likely reason is that you downloaded Reader, thinking it was
Digital Editions, and Reader does not use the file type that Digital
Editions does to download ebooks.
I looked and it said Adobe Digital Edition. I am using Windows 7 now and when I had Windows xp I was able to download my ebooks. Do you think that has anything to do with it?
Sorry - Digital Editions does not give you that error message. There's
nothing I can suggest in Digital Editions that will help fix an Adobe
Regarding ADE and Windows 7. There have been many problems with Win 7
security and ADE. Try doing a search on this site for Windows 7 and see if
the posts can help you.