If you do install it, make sure you go to the left on the CCleaner window and click on "Registry" and make sure everything has a check mark then "scan for issues" at the bottom.
Also make sure you go to the "Cleaner" on the upper left and clean the "Windows" and "Applications" of problems.
My laptop is like new again. It boots much much faster and all the programs load much faster and best of all I can now view all the instruction videos here without a problem!