Pre-requisite: go to http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html download http://the.earth.li/~sgtatham/putty/latest/x86/putty.exe and http://the.earth.li/~sgtatham/putty/latest/x86/puttygen.exe
- Click 'Generate' move the mouse around as instructed and wait