I just tried the website, at first my screen went white also intill I noticed my pop-up blocker was on. When I turned it off the page loaded.
Or the server might be busy on your end. Wait awhile then try again later.
well maybe your computer thinks it might have a virus on the emma watson website or it could have a possibility that the website might harm your computer. Its likely to do this if you have a protecting software on your computer. The website works fine for me http://www.emmawatsonofficial.com/#