This program worked just fine on my sons' Windows 7, but he took his computer home. My husband bought me a new Windows 8 to replace my old XP. Now it says I need to authorize my computer to use the program, never had to do this with the computer that I was using. If I could have gotten this program to work on my old XP, I would have been very happy with it. Finally went to bed with a migraine last night. There is no way that I could get it to let me authorize it to down load a book from my library to read.
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