Number 1 – CCleaner
CCleaner is a freeware system optimization, privacy and cleaning tool. Its is an extremely effective piece of software, making your computer less cluttered and run faster. Its also has an excellent registry cleaner, helping fix registry errors, remove fragments of uninstalled programs and making your computer faster.
This program is used by over 20 million people and is one of the best optimizers I have seen. It’s unique and speedy registry cleaner put it ahead of the most other optimizers. It truely is one of the best cleaner/optimizing tool out there.