System Optimizer and Cleaner

CCleaner is a system optimizer and cleaner that removes unused &
temporary files from the computer, allowing Windows to run faster, more
efficiently, and frees hard disk space. It features control over program
uninstall entries, control over startup entries, optional Registry backup
before cleaning, automatic checking for program updates, fast scanning,
and more. This is a superb system optimizer that flushes away dead
Registry entries and optionally removes unnecessary and wasteful files.
However, its biggest feature is its speed -- CCleaner is blindingly fast.
There are options to specify which cookies to retain, and even which
custom files and folders to include or exclude from the cleanup. Simple
to use, CCleaner is one of the best system cleaners. For details:
System Optimizer and Cleaner