Google Language on XP

I can't get my Google Search page preference to display my page in English, it always displays Japanese.
I have tried to set the Language to English in my Google Preferences but it always reverts back to Japanese.
If I call up http://www.google.com it automatically displays http://www.google.co.jp
I'm using Windows XP Pro with Internet Explorer 6.
I am located in Japan but my system is 100 % English with ALL settings set to English (not Japanese).
In Tools/Internet Options/Languages I have English at the top followed by Japanese (even if I delete the Japanese it doesn't help).
I have tried to delete all the Google cookies but it doesn't make any difference.
What other settings could be causing this problem.
Thank you.