Everyone knows the age-old, who became invisible because of the routine, the problem of data integrity, system disk, in such imperfect operating systems like Windows, and the problem of efficiency the operating system. Any updates as drivers and applications may result in the rejection efficiency of the operating system as a whole. Maybe with time, nevertheless there will be new high-tech and secure operating systems, but so far, these problems remain a reality. On any given day, while working on a computer that is working with information coming from the Internet, with a portable, laser disks, flash devices and possible places of access, where the test for the purity of the information was not made. In essence, any viruses, Trojans and other malicious software that gets on your computer, looks like a simple change information on your hard disk. As alignment sequence of bits in the construction of code. All the degradation effects that they may have, such as opening the port, affecting the penetration subsequently are also the trivial change information on your hard disk. Thus, every day, with access to internet or local network, the potential threat lies in wait for us. This can be fraught with irreparable loss of files, in the worst case of system or important personal. Loss of control over the resources of the computer, if the settings are changed without your knowledge. Most viruses enter into the activity at once, when they are started, perhaps unintended, but the effects often can be seen only on the next reboot the computer when the information will already be damaged and the computer will be their breeding ground. How can we fight it? Why anti-virus software become outdated, giving way to other methods of protection? First look at the oldest, sonorous, and from that, so far, a popular means of solving problems - anti-virus software. Antivirus scan all incoming external information on the executable, the infected files, and consume enough resources memory and processor, to significantly slow down your computer and frustrate you with their delay. Any anti-virus requires constant or variable Internet connection, or resources to update, because it needs to update their antivirus databases to deal with perfection codes new viruses and destructive interference. The more you upgrade, the more secure will your computer. Often this leads to the fact that the speed of the Internet for you will be reduced until after downloading updates. Also, most antivirus programs require an annual surcharge for renewal of a license to use, that financially looks rather unattractive. This means a solution is preventive, that is, prevents the ingress of computer viruses that have already been made into a vast database. However, not everyone can regularly access the Internet and update the database. Because of this, fresh viruses and Trojans still come and infect a computer, but with the consequences of such contamination antivirus cope, often can not afford. Recreate the lost files, they just do not know how.