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How to Clear search history in Windows 7
http://www.softwaretipsandtricks.com/guides/articles/25/1/How-to-Clear-search-history-in-Windows-7/Page1.html
By Super Admin
Published on 06/13/2011
 
Windows 7 also remembers your PC search queries.

How to Clear search history in Windows 7

Windows 7 also remembers your PC search queries, and displays the most recent examples when searching in Windows Explorer by default. This can often prove to be irritating for the same aforementioned reason. But you have an option to disable it.

Run gpedit.msc from the run dialog box, then go to User Configuration > Administrative Templates > Windows Components > Windows Explorer and double click on “Turn off display of recent search entries”.