This outlines the steps needed to set up windows machines in AWS, and install the bare minimum requirements for development machines (notepad++, OpenSSH, gdb). I used windows server 2008R2 SP1 64-bit, procedure for other version should be very similar.
Important: If you just want to use a machine already set up, like the windows 2008R2 dev machine, scroll down to "Spawning a new machine".
Instances/Images are stored per country, so make sure you have selected the appropriate country. If unsure, use Ireland.