CCleaner

It combines a system cleaner that removes unused and temporary files from your system and also a fully featured registry cleaner which allows Windows to run faster, more efficiently and gives you more hard disk space.
The best part is that CCleaner is a freeware (never pay for it ) PC optimization tool and it's Small and Fast to install and run.
features :-
Cleans the following Windows components:-

* Internet Explorer
Temporary File Cache
URL History
Cookies
Hidden Index.dat files
Last download file location
* Firefox
Temporary File Cache
URL History
Cookies
Download manager
Recycle Bin
Clipboard
Windows Temporary files
Windows Log files
Recent Documents (on the Start Menu)
Run history (on the Start Menu)
Windows XP Search Assistant history
Windows XP old Prefetch data
Windows memory dumps after crashes
Chkdsk file fragments

Advanced Options allow cleaning of:-
* Menu Order cache
* Tray Notifications Cache
* Window Size and Location Cache
* User Assist history
* IIS Log Files
* Custom Folder
Application Cleaning:-
As well as cleaning up old files and settings left by standard Windows components, CCleaner also cleans temporary files and recent file lists for many applications. Including:

* Firefox, Opera, Safari, Media Player, eMule, Kazaa, Google Toolbar, Netscape, Microsoft Office, Nero, Adobe Acrobat Reader, WinRAR, WinAce, WinZip and more...

Registry Cleaning:-
CCleaner uses an advanced Registry Cleaner to check for problems and inconsistencies. It can check the following:-
* File Extensions
* ActiveX Controls
* ClassIDs
* ProgIDs
* Uninstallers
* Shared DLLs
* Fonts
* Help File references
* Application Paths
* Icons
* Invalid Shortcuts and more...

Safety:-
CCleaner was designed from the ground to be safe and secure to use. It has multiple levels of checks in place to ensure that it cannot delete any useful information or documents you may still need. We also certify that it contains no Spyware or Adware.
High Security:
For the super cautious users we also offer secure file erasing. By overwriting the files before deleting them, making it impossible to recover the data.

Multiple Languages:-
Thanks to the translators, CCleaner is available in 35 different languages:-
English, Albanian, Arabic, Bosnian, Bulgarian, Catalan, Chinese (Simplified), Chinese (Traditional), Czech/Slovak, Danish, Dutch, Finnish, French, Galician, German, Greek, Hebrew, Hungarian, Italian, Japanese, Korean, Lithuanian, Macedonian, Norwegian, Polish, Portuguese, Portuguese (Brazilian), Romanian, Russian, Serbian Cyrillic, Serbian Latin, Slovak, Spanish, Swedish and Turkish.
Download :-
download the latest version of ccleaner from official site
http://www.ccleaner.com/download this product is completely free you will never asked for any kind of purchasing and iam using this software instead of other expensive softwares as system mechanic, registry mechanic and all other pc tools which are uesless and ccleaner having all this features and also for free enjoy .