To make the Google as the default search engine in your computer, please change the below given registry settings.
[HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main]
"Use Search Asst"="no"
"Search Page"="http://www.google.com"
"Search Bar"="http://www.google.com/ie"
[HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\SearchURL]
""="http://www.google.com/keyword/%s"
"provider"="gogl"
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Search]
"SearchAssistant"="http://www.google.com/ie"
