BleepingComputer.com: Default Language changes when changing Style Sets in Word 2007

I am using Windows Vista (fully updated with SP2) and when I start Word 2007 the Style Set looks like Word 2007 but when I go to Change Styles, Style Set it appears that nothing is selected, i.e. there is no tick by Word 2007. If I change the Style Set to any of those listed the Default Language changes from English (United Kingdom) to English (United States).

I've used the Control Panel to check that the languange for my system and keyboard is English (United Kingdom).

It appears that I am not the only one who has a problem like this (http://www.pcreview.co.uk/forums/thread-3798232.php), and its a really annoying one.

Please help!

This post has been edited by disCompulsion: 21 July 2009 - 03:43 PM