How do I add my downloaded language pack to MS word?

I downloaded German language pack for MS word, but when i open word it hasn't recognized this. The pack is from a torrent but not sure if this is the issue. How to I get word to recognize the package so I can proof word using the German dictionary and the English dictionary? Any help would be useful.
I'm using a Compaq computer with Windows Vista and MS Word Office 2007.

Adamina
June 2009