Why is the download panel in Japanese?

Windows 7 Pro x64 (English version), Waterfox 13, as well as IE9.

Tried to download Digital Editions today in order to reproduce a problem someone else was having.

1. went to http://www.adobe.com/products/digitaleditions/
   
2. click on Download now
   
3. click on ｲﾝｽﾄｰﾙ
   
4. click on ｲﾝｽﾄｰﾙ again
   
5. click on はい
   
6. now this panel opens
   

Now I really don't know how to continue; my Japanese is not good enough.

Why does the installation have to be in Japanese?

How can I change it to English?

P.S. and an additional question: if I continue the installation here with the default values, will the installed product UI also be in Japanese?