Probably the most cleaner globally with over 1 billion downloads since its launch in 2003. Piriform's CCleaner is a quick and easy to use program which makes your computer faster, more secure and more reliable. CCleaner removes cookies, temporary files and various other unused data that clogs up your operating system.

This frees up valuable hard disk space allowing your system to run faster. Removing this data also protects your anonymity meaning you can browse online more securely. The built in Registry Cleaner fixes errors and broken settings to make your computer more stable. The simple, intuitive UI anrapid but powerful cleaning make CCleaner a favourite among novices and techies alike. Professional, Network, Business and Technician Editions of CCleaner are also available for serious users.

CCleaner cleans the following components:
Internet Explorer
Cart
The Clipboard
Temporary Windows files
Windows Logs
The list of recent documents (in the Start menu)
The history of executed commands (Start)
The history of the assistant search in Windows XP
Obsolete Data Prefetch in Windows XP
Memory dumps after crashes Windows
Chkdsk file fragments
Advanced options allow you to clean:
The cache priority menu
The cache sizes and locations Windows
The history of aid to the user
IIS log files
Additional Folders
Whats New:

v5.27.5976 (14 Feb 2017)
Improved Firefox History and Session cleaning
Improved Opera History cleaning
Improved Thunderbird Session cleaning
Optimized 64-bit build architecture
Updated various translations
Minor GUI improvements
Minor bug fixes

Instructions:
Disconnect from internet (Important)
Unpack and install
Run and use given key and anyname to register
Done