taken from
https://www.mobileread.com/forums/showthread.php?t=29796
For Vista Uninstall it
then Delete the following folders
C:\ProgramData\kinoma
C:\ProgramData\Marlin
C:\Program Files\Sony\eBook Library
C:\Users\%username%\AppData\Local\Sony Corporation
C:\Users\%usernam%\AppData\Local\kinoma
After doing so, reinstall your Connect Reader software from:
http://ebooks.connect.com/downloadclient.html