In Security we found the most recognized and efficient antivirus and firewalls that will protect our computer from the malicious software found on the Internet, as well as being a useful application for the passwords security administration and the files encrypting. With the growth of the Web, the computer security has become a central preoccupation before the proliferation of threats and intrusions that leave our privacy and data unprotected. The solution will be then to have a suitable protection in each case.