Detect and neutralize malicious programs running on your PC.
OSSEC is an Open Source Host-based Intrusion Detection System. It performs log analysis, integrity checking, Windows registry monitoring, rootkit detection, time-based alerting and active response.
Website is useless for help. When installing it asks for a code generated by the company's server. But it doesn't send the code to you when you prompt it to so the program could not be run since installation could not be completed.