http://altocircuito.net/darkchild/dingoo/DingooSDK.exeDownload, install, 'nuff said!
installs cygwin and S2DSDK
No toolchains installed though...
And in the setup, there is a website with instructions on how to set windows environment variables and which ones to add.
Since some might think its too complicated to do it manually, this might help!