Goto the google home page (
http://www.google.co.uk ) and then click on tools > internet options and then click the button that says "use current" under the home page options to set your home page to google. then just below the home page settings there are the settings for tabs, click on the settings button and from the pull down menu labeled "when a new tab is opened, open" select "your first home page"
To change the search for the top right hand corner search box click on the little arrow next to the magnifying glass to the right of the search box and select "find more providers" then on the web page that comes up look for Google and click the "add to internet explorer" on the little popup that comes up make sure you have a tick in "use as default" and click OK.