Every time you enter in the address bar of your browser site name, your computer before you connect with him, must transform this "letter" in the name of its corresponding number.
To do this, the system queries the DNS-servers, which store address information. A typical user computer connected to the Internet is not able to make changes to the database DNS-servers. However, the operating system has a file Hosts, who also keeps a consistency of letter names to the numeric address, and while this file has priority over service poll DNS-servers. That is, if address information is not in the file hosts, then the system then queries DNS-server, and vice versa: there are no poll servers if the address is in the local hosts-file. Some viruses modify this file, pointing to the wrong address, then, for example, becomes impossible to connect to the server antivirus . Therefore, it will be useful to prohibit viruses do.
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