Date Added: Aug 2010
In computer networks, the computers can be categorized into two categories, one is susceptible or healthy and another is infected. The susceptible computers can have the Anti Malicious Software (AMS) or cannot have to protect themselves from the malicious objects. In addition they can have a costly action to self-harden themselves against the malicious objects for proactive defense. The utility cost of being susceptible or infected is the major concern of this paper. The paper considers the role of AMS and the self-hardening action to find out the lifetime utility of a computer.