Language change for Office 2007

I've installed a UK purchased version of Office 2007 on my Spanish computer, running Spanish Vista.
Initially it installed ok in English, but it has now changed to Spanish.
All of the regional and keyboard settings on Vista are set to English, as are the language settings in Office, but all the menus and commands are still in Spanish.
I installed the same version of Office on my English bought netbook, and it all works fine and in English.
How can I change it back to English?

You can try by reinstalling it again in your computer and see if that works for you. Don’t customize anything while installation. Let it be installed on with the default settings. I hope reinstallation will help you.