If you’ve heard of Nmap, it’s a very powerful, and in my opinion the best security scanner available. Last time, it used to only run on Linux, but now it is available for Windows as well except no graphical interface is included, so you need to run nmap.exe from a DOS/command window. Everything is in command line and there’s a long list of command lines available for you to use. Can be quite tough and confusing to use if you’re a newbie.
There used to be Nmapwin and also eEye NmapNT that provides the graphical user interface for Nmap. All you need to do is just click the checkbox available and enter the hostname or IP address. However, both GUI for Nmap is obsolete and no longer works with the latest Nmap. Thankfully there’s another one that keeps its free Nmap frontend up to date with Nmap….
NmapView is a Windows frontend for Nmap the free security scanner made by Fyodor.

Dedicated to all those that, like the author of NmapView, love Nmap and use Microsoft Windows. NmapView works with Nmap version 4.x and is compatible with Windows 2000, XP , 2003 and Vista.
Features of NmapView
In order for NmapView to work, you must download:
1. Winpcap
2. NmapView
3. Nmap for Windows from Insecure.org
4. Microsoft .NET Framework 2.0. If you already have it installed, then you can skip this. Otherwise it’s a must for NmapView to run.
Install Winpcap, then extract NmapView to a new folder. Extract Nmap to a new folder and place it IN NmapView folder. Run NmapView.exe and start scanning!