CCleaner: Your PC Wants It

CCleaner is an amazing little program (about 2.7 Mbs installed) that helps keep your computer fresh and clean. It is simple to use, and Piriform (the company that makes it) works hard to keep CCleaner up to date.  I have personally been using CCleaner for well over a year. It has helped keep my PC running like new.
CCleaner cleans out your browsers cookies, history, temporary files and more. You are able to customize what you would like cleaned and what you would like left alone by placing checkmarks in boxes next to the cleaning options.

CCleaner also has a registry cleaning feature. You are able to scan for issues and then fix selected issues. You can save a backup of your registry before fixing, as well. CCleaner has many other useful features, such as add/remove programs, and the ability to view and delete old restore points.

Piriform supports CCleaner and its other applications through donations and the inclusions of the Yahoo toolbar in its installers. If you do not need the Yahoo toolbar, be sure to uncheck the option when installing CCleaner.

All in all, I highly recommend CCleaner. It is a versatile, highly customizable, and easy to use program with many helpful features. Plus you can't beat the free price tag!