Hi, I'm Robert and I'll be helping you with your computer question.
where did you get the 2007 from?
it is asking you to put in a microsoft email address and password ***** that it can register the product to you and/or confirm that you own it.
If you have a microsoft email address or used one when you purchased it, put that in.
they would end in something like @hotmail.com or @outlook.com or @live.com or @msn.com
or many others.