CCleaner by Piriform has been one of the most reliable PC utilities that I have found. Oh, and it’s free. (There are pay programs if you want the support.)
What does it do?
CCleaner cleans out the temporary files, history, cookies, download history, form history, and more from internet browsers such as Internet Explorer, Firefox, Chrome, Opera and Safari. It also cleans the Recycle Bin, Recent Documents, Temporary files and Log files in Windows. Oh, and that’s not all! It will clean up registry errors, help you uninstall programs, and clean up your start-up programs all from the same screen. (It does more, but those are the things that I care about.)
I know many of these things can be taken care of through items in the control panel, but CCleaner has a clean interface that makes things work easily. They also stay on top of changes and update their software on a regular basis. Piriform also offers Defraggler (a disk defragmenting tool), and some others that I have yet to use. Defraggler works about as well as CCleaner.