Passwords

I bought DiskAid to transfer/copy my messages, contacts, notes, and calendar from IPhone 4 to PC, tried on both Windows 7 and 8. I had no problem in transferring my Camera Roll and other Pictures but when it came to the above mentioned tasks, it asks for my itune encrypted passwrod - I have never used one but it refuses to perform any other tasks beyond until I did. I have tried any and all passwords ever used, still no luck. I would greatly appreciate any help. Thanks!