Antimalware, software that prevents malicious attacks on networks and systems, is a must-have at most organizations. The potential for damage from worms, Trojans, keystroke loggers, rootkits and more, is so great that the majority of businesses require antimalware to be installed on all host devices. And the negative impact from malware is perceived as so threatening that many regulations and standards (HIPAA, PCI-DSS) call it out specifically.