Problem transferring ebooks via ADE to a reader.

The reader: HANVON wisereader 526. PC: Windows 7, SP1, 32bit. The problem: Trying to transfer ebooks from the PC via ADE used to work perfectly with ADE 2, after having installed ADE 3 reader and program started blocking each other. They both work separately but not together. After reinstalling ADE 2 problem remained, same story with ADE 4.?? Tobias