These two free apps are Piriform CCleaner and Auslogics Disk Defrag, i call them "CC" and "DD" for short, because i usually run them by typing "cc" and "dd" in the "Run" box to call them. (surely, this needs you change the default "Path" value in the "Environment Variables")

How to

  1. Run CC to clean out the junk files and registry safely
  2. Run DD to defragment C volume
That's all, after that, i am sure you will find your PC becomes more faster than just now!