When you deploy Internet Explorer 7, Live search is configured as the standard search engine. To change this setting to the Google search engine by registry, you can import the following settings:
To remove Live Search:
[-HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\SearchScopes\{0633EE93-D776-472f-A0FF-E1416B8B2E3A}]
To configure Google as default search engine: