I had a problem long ago with SP crashing,even after uninstalling/reinstalling it.I found I needed to uninstall SP,go to C/users/username/app data/roaming and delete the sound packager file found there,then reinstall SoundPackager.After that,SP has worked for me ever since.(Vista,32 bit)
Btw,that file is a hidden one,you'll need to go to folder options and check "show hidden files and folders" to see it.I hope this helps.