Note: we no longer recommend Xming + SSH, but MobaXterm, as it is a complete package with SSH & X Server bundled.
Xming is a freeware product for Windows that supports displaying X graphical sessions. Download from here: http://sourceforge.net/projects/xming/files/
It’s recommended to install both Xming and Xming-fonts
Once installed, start Xming before opening SSH sessions that you would like X graphics to be displayed.