QProgressDialog stucks

[Mystical Groovy]

i dont want to create new slots and staff so ill use the standart system() function

code ive used but its no working:

QProgressDialog progress("Installing Package...", "Cancel", 0, 0, this);
        progress.setRange(0,0);
        progress.setWindowModality(Qt::WindowModal);
        qApp->processEvents();
 
        while(progress.exec())
        {
        system ( InstallPkgCom ); //install package
        }
 
        progress.close();

QProgressDialog progress("Installing Package...", "Cancel", 0, 0, this);
        progress.setRange(0,0);
        progress.setWindowModality(Qt::WindowModal);
        qApp->processEvents();

        while(progress.exec())
        {
        system ( InstallPkgCom ); //install package
        }

        progress.close();

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