ircII EPIC4 For Windows
A port of the popular IRC client to Windows. Includes an easy to use GUI front end and is fast and secure. Most major ircII scripts for the UNIX/Linux version can be used with this client easily. Includes full documentation.
http://www.sosdg.org/epic4-win32/epic4-installer.exe - 2Mb - Download - Screenshot

ircII EPIC5 For Windows
A port of the popular next generation IRC client to Windows. Includes an easy to use GUI front end and is fast and secure. Most major ircII scripts for the UNIX/Linux version can be used with this client easily. Includes full documentation.
http://www.sosdg.org/epic4-win32/epic5-installer-0.3.1-build1.exe - 2Mb - Download - Screenshot