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I've got a couple of recommendations. First off you can demote a site link in Google Webmaster Tools. You can find the option in configuration/sitelinks. Although Google is obviously assuming that the pages with current site links are important somehow so it might be a good time to recheck your site architecture. Secondly you should probably remove the no-follow attribute from internal links on your homepage. They won't be having a beneficial effect and could negatively impact how search engines view certain pages on your site. Hope that helps.