Best Free Cleaner

Using your PC is not a traceless activity. Whatever you do can be monitored, collected, evaluated and used to make a profile of you and your activities.

The documents you work on are saved in (most) recent file lists (MRU), you play a song with your Media Player, you download using something like eMule, you burn data with say Nero, read with Acrobat Reader or compress files, all application leave recoverable traces on your system.

When you browse the net, all sites you visited are stored in your browser history, and many sites leave information about your visiting habits and behaviour in a 'cookie', a file on your PC, which can be read and evaluated by anything that knows it is there. Google is infamous for creating these profiles and just in case you do not want your life to become a public record, you might consider to remove the traces at your own discretion.