Sugar on Windows
No one has ported Sugar to Windows (that we know of) but you can run Sugar on Linux in an emulator on top of a Windows System.
Note: Alternatively, you can boot your Windows machine with a Sugar LiveCD or LiveUSB—this will enable you to run Sugar without making any modifications to your Windows machine. See Supported_systems#Starch.)
Note: The Wine Activity lets you run many Windows applications from within Sugar.
A Sugar installer for Windows
Wade Brainerd wrote a simple Sugar installer for Windows:
It installs/uninstalls a working Sugar environment (based on Ton van Overbeek's QEMU—See below) with just a few clicks.
The installer was built using the open source installer creator NSIS (nsis.sourceforge.net). The installer script can be found here: wininstall/.git
Note to build administrators: NSIS exists for Linux, so this process of creating Windows installers for Sugar could be automated.