How to install Harvard referencing style to MS Word 2007

First download the file (styles.zip) from this link
http://bibword.codeplex.com/releases/view/15852

Then copy the file named 'HarvardExeter.xsl' to the following directory
C:\Program Files\Microsoft Office\Office12\Bibliography\Style

That's all

Watch the video for step by step tutorial if you don't really understand what its said in that site.