private static IInstalledProgram RetrieveInstalledProgram( RegistryKey subKey )
{
var installedApplication = new InstalledProgram();
installedApplication.DisplayName = subKey.GetValueOrDefault<string>( "DisplayName" );
installedApplication.EstimatedSize = subKey.GetValue( "EstimatedSize" );
installedApplication.InstallLocation = subKey.GetValueOrDefault<string>( "InstallLocation" );
return installedApplication;
}