How to Change Internet Explorer's Default Search Engine Settingby Zicheng Ren
Step 1: Open Internet Explorer and choose Manage add-ons from the Tools drop-down list.
Step 2: Choose Search Providers from the list of Add-on Types on the left of the window to open the settings for search engines.
Step 3: Select from the list the search engine you want to use and click Set as default. For example, replace the default search engine Bing with Google. Use the Remove button to delete unwanted search engines.