CCleaner (Crap Cleaner) is a freeware system optimization and privacy tool. That removes unused and temporary files from your system - allowing Windows to run faster, more efficiently and giving you more hard disk space. The best part is that it's fast! (normally taking less that a second to run) and Free.

Download: CCleaner 1.37.456 Standard (2,622KB) | Basic (607KB - No Toolbar) | Slim (450KB - English Only, No Toolbar)
View: Changelog | Screenshots | CCleaner Homepage