Help to stop people getting hacked?

I came up with an idea. That when you register you have a special question which only you know the question to. And then, they make the computers recognise the regular IP so whenever someone with a different IP tries to log onto your account, they need to answer that question.

:D
~

Well what happens if you forget the answer?

You have to send off emails etc etc.

Meaning the person who wants to hack you will pretend to be you, hack your email etc etc.

(It happened to me)

It wouldn't work