A method for updating antivirus files on a computer using push technology is disclosed. In a preferred embodiment, updated virus signature files or other updated antivirus information is loaded onto a central antivirus server, while local push agent software is installed on the client computer. When the user of the client computer is connected to the Internet, the push agent software operates in the background to receive updated antivirus files from the central antivirus server across the Internet, in a manner which is substantially transparent to the user. In another preferred embodiment, antivirus files on a plurality of client computers on a corporate computer network are automatically updated using push technology and automated network installation scripts. A service computer associated with the plurality of client computers receives one or batches of antivirus updates from a central antivirus server across the Internet using push technology. An automatic installation script is executed to install the antivirus updates on the client computers of the corporate computer network with a minimum of involvement from a corporate system administrator or, optionally, no involvement from the corporate system administrator.