Piriform Ltd

CCleaner is a freeware PC optimization tool. It combines a system cleaner that removes unused and temporary files from your system and also a fully featured registry cleaner! CCleaner allows Windows to run faster, more efficiently.

It differs from other defrag tools on the market, by enabling you to quickly and simply defrag the files you want to, without having to process the whole drive. Simply run it, select the file and defragment in seconds. No more struggling with the Win

Recuva is a freeware Windows utility to restore files that have been accidentally deleted from your computer.