When you open the Search window in Windows 7, the previously typed search queries (MRU) are displayed in the Search bar. Also, when you type a search query, the autocomplete lists possible matches as you type. Here is how to clear the search entries individually and collectively.
You can remove an item from the Search MRU list by highlighting that item (using the mouse, or Up/Down keys) and then pressing the DELETE key.
To clear the entire Search MRU History via the registry directly, use these steps:
1. Click Start, type Regedit.exe and press ENTER.
2. Navigate to the following branch:
3. Right-click the WordWheelQuery branch and choose Delete
4. Exit the Registry Editor.
To automate the above task, download w7_clearsearchmru.zip. Unzip and run the enclosed REG file.