How do I clear the history from my original Google home page (before
Google Toolbar was installed)?

Hello Desertgranny.

This is a function of Internet Explorer called Autocomplete. To clear
this:

1. select "Internet Options" from the Internet Explorer "Tools" menu.
2. Select the "Content" tab at the top of the "Internet Options"
window.
3. In the "Personal information" section at the bottom, click the  
"AutoComplete" button.
4. On the AutoComplete Settings window, click on the "Clear Forms"
button.
5. You will get a window asking you to confirm clearing the history.
6. Click "OK", and you're done.

To turn this function off simple uncheck the 'forms' checkbox. 
These instructions should work with IE versions 4-6. If you have any
problems please use 'clarify answer' before rating this answer and I
will help you out.

Thanks!
-shiva777