Unable to de authorize old computer and email address

I am trying to download books but adobe doesn't let me put in the primary address I want to use it keeps registering me to an old email address and xp computer I now have a window 7  I had used my primary address before then adobe wouldn't let me sign in so I had to use the secondary email address now I can't get rid of it and digital edition won't work between my computer and my e reader because of the different email address. how do I fix it.

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