Now I get it what r u looking for.
Go e-explorer tools and chose internet options, then chose languages (or something like that), and finaly chose plus to add an extra language to your browser.
A site says this: Select the fonts that should be used by the browser for the Greek encoding.
Go to: Tools -> Internet Options -> Fonts. Select Greek in the 'Language Script' area.
The site: http://www.geocities.com/learnmgreek/lgdown.html