Nessus for Windows is the world-leader in active scanners, featuring high-speed discovery, configuration auditing, asset profiling, sensitive data discovery and vulnerability analysis of your security posture. Nessus scanners can be distributed throughout an entire enterprise, inside DMZs and across physically separate networks.

Nessus is supported by a world renowned research team and has the largest vulnerability knowledge base, making it suitable for even the most complex environments.

Using Nessus at work? When using Nessus in a corporate environment (even when scanning your company's own servers) you must subscribe to the ProfessionalFeed. Not only is this the Right Thing To Do, but the ProfessionalFeed gives you access to more plugins (including PCI), pre-configured auditing policies, and commercial support. Click below for more information:

Nessus for Windows is available for Windows XP, Server 2003, Server 2008, Vista and Windows 7.
Nessus for Windows is distributed as an executable installation file. Place the file on the system it is being installed on or a shared drive accessible by the system. You must install Nessus using an administrative account and not as a non-privileged user.

The license of this software is Free Trial Software, you can free download and get a free trial.