Clear Search History from Internet Explorer

You can delete the history of search bar on your homepage (whatever it is either Yahoo! or Google) by the follows :

Tools > internet options > content > auto complete > clear forms.

To stop the generation of history uncheck the box of "forms".

You can delete the search history on your yahoo toolbar this way. Click the arrow in the search box. Select options, click clear history. Follow this path also. Pencil > toolbar options > uncheck the boxes of enable auto complete and enable history > ok.

To delete address bar history, follow this path. Tools > internet options > general > clear history > set the number of days to zero > ok.