Here is a way to clear the GOOGLE Toolbar History by performing these steps:
1. Start the registry editor(by typing regedit.exe in cmdpromt).
2. Navigate to the HKEY_CURRENT_USER\Software\Google\NavClient\1.1 registry subkey
3. Select the History subkey, click the Del key on your keyboard, then click Yes to confirm.
4. Close the registry editor
And that is it. Please be careful while deleting the key.
1. Start the registry editor(by typing regedit.exe in cmdpromt).
2. Navigate to the HKEY_CURRENT_USER\Software\Google\NavClient\1.1 registry subkey
3. Select the History subkey, click the Del key on your keyboard, then click Yes to confirm.
4. Close the registry editor
And that is it. Please be careful while deleting the key.