Heathero, it sounds like your browser is having an issue with the login.live.com page. The URL you've pasted is a link that should direct you to login with your Windows LiveID at login.live.com and then redirect you back to Office Live's webpages. To help you past this issue, send me the following information so I can asses what the issue may be.
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Where in the sign in process do you get the blank screen? Is it when you click 'sign in' from Office Live's pages or after you've logged in with your LiveID?
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What browser are you using?
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Double click the yellow triangle in the bottom left and copy/paste the error that you are getting into your reply.
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If you have access to multiple computers, can you reproduce the issue on all of them?
Thanks,
Chris