The Internet is growing explosively, as is the number of crimes committed using computers. In a case of cyber crime the evidence is in electronic or digital form (0s & 1s; bits & bytes). As a response to the growth of computer crime, the field of Computer and Network Forensics emerged. Computer forensics is the art of discovering and retrieving information about a crime in such a way to make it admissible in court. It is the art of gathering evidence during or after a crime. It is after-the-fact in that the only preventative capability of computer forensics is as a crime deterrent. In this paper, we propose enterprise network and computer related policies that will deter computer crime and enhance recovery from attacks by facilitating computer and network forensics and also discuss about cyber forensics. The main focus of this paper is providing security to digital evidence.