CCleaner is one of the best freeware system optimization and privacy tool. It removes all the unused files from your system - allowing Windows to run faster and freeing up valuable hard disk space. It also cleans traces of your online activities such as your Internet history. CCleaner is certified by Softpedia which means it contains no spyware or adware. It works with Windows 98/NT4/ME/2000/XP/2003/Vista. The file size of CCleaner is only 2.78MB
CCleaner Cleans the following :
- Internet Explorer Cache, History, Cookies, Index.dat.
- Recycle Bin, Temporary files and Log files.
- Recently opened URLs and files.
- Third-party application temp files and recent file lists (MRUs).
- Including: Firefox, Opera, Media Player, eMule, Kazaa, Google Toolbar, Netscape, Office XP, Nero, Adobe Acrobat, WinRAR, WinAce, WinZip and more...
- Advanced Registry scanner and cleaner to remove unused and old entries.
- Including File Extensions, ActiveX Controls, ClassIDs, ProgIDs, Uninstallers, Shared DLLs, Fonts, Help Files, Application Paths, Icons, Invalid Shortcuts and more... Backup for registry clean.
- Windows Startup tool.
DOWNLOAD CCLEANER Version v2.08.588


Thanks for the post!
I suppose one can't have everything for free, but it's a shame CCleaner doesn't have more tools, like a defrag utility etc. So after using it for sometimes I switched to Auslogics BoostSpeed (alright, it costs USD$30, but it has lots of optimization tools.) Here's the website: http://auslogics.com/en/software/boost-speed