In order to remove, or shred files permanently from your system you have to use a program that is capable of rewriting the files with random series of binary data multiple times. This process is often called shredding. That way, the actual content of the file has been overwritten and the possibilities to recover such a shredded file are mostly theoretical.
File Shredder has been developed as fast, safe and reliable tool to shred company files. The author of this program released it free under GNU licence and you are welcome to download File Shredder and use it without any restrictions. File Shredder is simple but powerful program that surpasses manu commercial file shredders out there. The Author believes that such a utility should be available to anyone for free and that permanent and safe removal of confidential documents is a matter of basic right to privacy.
In File Shredder you can choose between 5 different shredding algorithms, each one gradually stronger than the previous one. It also has integrated Disk Wiper which uses shredding algorithm to wipe unused disk space.