In Internet Explorer you can change or add search engines that your browser can use to find information. To change the search engine used by the search field click the drop-down menu next to search field, then select any of the providers: MSN, Amazon, eBay, etc.
To add more providers, in the search drop-down (in the upper-right corner of the browser window) menu select 'Find More Providers...' Then select the search engine you want to use. After you make your selection, press the 'Add Provider' button.
To select a default provider, in the search drop-down menu select 'Change Search Defaults...'. Select the search provider you want to be your default, then press the 'Set Default' button.