How can you remove Smart Defrag completely from your machine?

Your computer is infected by the Smart Defrag rogue program but you cannot completely remove it? It will be annoying to find how the Smart Defrag works on the computer. It will start a scan automatically as you start up the computer, display some fake scan result so as to trick you into purchasing the full version. But the problem is that, all the detected threats are non-existent. To secure your computer and your wallet, you should remove Smart Defrag completely.