TS3992 Trying to back up my iPhone 4s

I have an iPhone 4s and trying to back it up on my computer and it ask me to "Authorize This Computer" Pops up since trying to encrypting my back up.  Everytime I put my iTunes password, it rejects it.  What am I doing wrong?
I know the password to my iTunes account, but it still will not let me back up and it tells me I need to Authorize the computer.

I have done that, but it won't take my iTunes user name and password even though I know that.
By the way is there any way to reset the Encrypt iPhone backup.  I don't need to do a restore, but just want to make sure I know the password for this so I can back it up with encryption.

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