Registration of trial product: Microsoft Office Home and Student 2

Greetings

I downloaded a trial version of Microsoft Office: Home and Student 2007 from
the following URL:
http://us1.trymicrosoftoffice.com/de...?culture=en-US

Upon opening up one of the components of the package, I was prompted with a
walkthrough on how to register the product. I wanted to do so, so I followed
it up until I hit a problem.

It brings me to a webpage that it claims will ask me for credit information
in order to send me the registration key I'll need to use on the trial
product. Upon opening the webpage, a couple of seconds into it, I'm prompted
with a login interface asking for a username and password, of which was not
supposed to happen (according to the on-screen instructions the program
provided), and even if it was, there's nothing telling me what it is I need
to enter for a username and password.

Can someone either shed some light on what's wrong or at least point me in
the right direction of who I need to ask?