We had ADE on a system whose hard drive was dying and becomming unusable. I replace the old hard drive with a new one and resinstalled everything. I was able to extract the My Digital Editions Folder from the original drive and copied it to the new drive. I then installed the latest ADE. When we attempt to authorize the new ADE install on the new harddrive we see the dreaded "You can only authorize this computer with an Adobe ID that hasn’t previously been used to authorize any other computer or mobile devices. Please try again."