Word 2007 Cannot Register Account

Up until last month I have happily been using Word 2007 to publish my blog posts. I recently changed servers and also put my WordPress installation into a /wordpress folder so things have changed with my blog, but I have also upgraded from 2.5 to 2.6.2. So it could be any damn thing!

Now, Word jsut gives the message “Word cannot register your account”.

Any ideas?