iTunes thinks I have a Backup password.

I just installed iTunes on my Windows 10 Pro computer for the first time so I could transfer files from my old iPhone 6 to my new iPhone 6, I backed up the old iPhone without a problem, but then when I plugged in my new iPhone, it asked me for a Encryption Password (which I did not set). I went back to my old iPhone to try and make a backup without a password (changing password or deselecting encrypt iPhone backup) it tries to make me put in a password, I have tried all the possible passwords it could be even though I never set a password in the first place.

Thanks for any help