Unfortunately it's asking me to install the Japanese language support package for Adobe...sigh.
Thanks for share though!
Edited to say: I just upgraded my Acrobat Reader to v.8.1 and was asked when I revisited http://www.rakuten.co.jp/gosyo/46139
and opened a pattern, If I wanted to download the Japanese language support file, which I did, and now the site works perfectly.
Hope this helps anyone who wants a look-see and has my original problem