A new snapshot of the mingw-get graphical user interface is now available from http://tinyurl.com/cdc7sym; this corrects the defect which made the previous snapshot unstable on WinXP-SP2/3. In addition, it includes an optimization to provide accelerated update of the mingw-get package catalogue.
Installation instructions may be found at http://tinyurl.com/6madwlo,
under the "Using GUI Installer Development Snapshots" subheading.