To Delete Your Search History on Google:
1. Go to: www.google.com. In the upper-right corner, click "Sign In."
2. Enter your Gmail address, followed by your password. Click the "Sign In" button.
3. On the next page, click "My Account" at the upper-right.
4. You should see the words, "My Services," in bold type close to the top-center of the page. Click the "Edit" link beside those words.
5. Click the link labelled "Delete Web History."
As a further suggestion, we recommend that you use www.mamma.com or www.ask.com for future searches. Those sites don't store your history until the end of time, or at least don't admit to doing so.
Happy searching, friends.
Shortie