I'll admit that I'm not a pc genius,or semi-expert,just the layman who never learned anything but what I've delved into these past 8 years envolving quite a lot of searching for how to do things and much learning.I don't play pc games,just learning new capabilities for myself is fantastic.
Without a doubt ccleaner is the best and my favourite app ever downloaded.After 4 years its a pleasure to run it,which I do a few times daily. Same with the Defraggler,though not as often for sure. Reccuva is also great.