Abstract: A system for targeted advertising. The system comprises a client computing device having Internet connectivity and at least one display screen, a browser software adapted to run on said client computing device for accessing World Wide Web content, an advertising software adapted to run on said client computing device, said advertising software allowing the user to indicate preferred categories of advertisements. The advertising software comprises means for downloading multimedia files comprising moving image advertisements in according with said preferred categories and the advertising software is adapted to display said multimedia files as moving image advertisements on the screen. When running, the advertising software is adapted to at least temporarily block access to World Wide Web content.