'Take your computer' ... ??? ... & 'chocolatey' recommendation form Rags P. - ...hmm too complex and won't work for stuff embedded in the actual programme like Avast's stuff in CCleaner.
Just get CCleaner version 5.40 (still available on softpedia and file hippo etc - or get CCleaner PORTABLE from there and download it direct to a USB stick and run it from USB stick. Tidying your registry will make no difference to your computer unless the registry is completely corrupted - but then you need more than a freeware cleaner).
I personally would recommend getting 'Malwarebytes Adwcleaner' (free), and 'PCDecrapifier 3.0.1' - small freeware programmes that don't install anything and just help you clean crp of the computer.