System Mechanic is a collection of system maintenance tools designed to help keep your computer running smooth, fast, and error free.

The program includes tools that find and fix broken shortcuts; clean the Windows Registry; manage Windows StartUp applications; track system changes made during program installations; find and remove duplicate files, junk and obsolete files, cache files, history logs, cookies, and invalid uninstaller information; tweak your system for faster Internet and network speed; allow you to safely and securely dispose of sensitive information, files and folders; and schedule maintenance.
More info:
hxxp://www.iolo.com/sm/index.htm

Download Trial Versions:
hxxp://www.iolo.com/download/default1.htm

B) I have been using it for a long time, I found it works well except for the Interne tweak part,

Moving to member submitted news.... :)