How to change the look and feel of a single part of a java program

So I'm making a program selection tool, and currently i like the way everything looks with just the java look and feel. the only thing i want to change is the JFileChooser look and feel to Windows. When i call the filechooser and tell it to change the look and feel then, it doesn't do anything. when i call it when the program starts, it makes the buttons look crappy. so google doesn't have anything, and i cant figure out how to get this to work. please help! let me know what code would be relevant and useful. Thanks in advance!

EDIT: So here's some code relevent to the JFileChooser and how it is started:

public class Start(){
    public static JButton assignButton = new JButton(new AbstractAction(
        "Assign") {
    public void actionPerformed(ActionEvent e) {
        AssignWindow.run();
    }
});
}

public class AssignmentWindow(){
   public static void run() {
    Dialogs.assignmentInfo();

    bgImage = aw.getImage("files/background.png");

            //aw is the object of this class
    aw.makeFrame();     //makes the jframe for all the buttons to sit.
    aw.setGraphics();   //assigns a different graphics variable

    aw.fileChooser();
}

public void fileChooser() {
    JFileChooser jfc = new JFileChooser();
    jfc.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);

            // here is where i want to set the look and feel....

    if (jfc.showDialog(null, "Select") == JFileChooser.APPROVE_OPTION) {
        File file = jfc.getSelectedFile();
        fileDir = file.getPath();
    } else {
        Dialogs.msg("You cancled selecting a file. Returning to file frame...");
        AssignWindow.destroy();
    }
}
}