StuffPlug-NG 2.0? There's a newer Version....
But I don't have really an idea how to solve your problem. Just try to install the latest SPNG.
Latest StuffPlug-Version: http://files.stuffplug.com/SPNG2.1.243.exe
Official StuffPlug-NG German Translator.
Offizieller StuffPlug-NG Deutsch-Übersetzer.