After using Iolo's System Mechanic utility for a year, I now have replaced it completely using CCleaner. I found System Mechanic to be cumbersome, duplicate functions and some features just did not work. Am really happy with CCleaner' performance, support and $0 price.
I like answering posts like this leonard. Pretty difficult even for me to give a bum answer.
Just remember to use the back up feature if you run the registry cleaner, and don't forget the amazing support on here which is also free.
Have you looked at Piriforms other free software tools?
I've linked you to the "guides" site, from where you can find the downloads.
And welcome to the forum.