Applet not running outside of netBeans

I have an applet that was compiled & built within NetBeans 4.1 under jdk1.5.0_04. It runs perfectly inside of NetBeans. It doesn't run outside of NetBeans.
I created the HTML launcher file and placed it in the same folder where the applet class file resides.
<HTML>
<BODY>
<APPLET CODE=Main.class
WIDTH=250
HEIGHT=130>
</APPLET>
</BODY>
</HTML>
When I launch the HTML file under windows XP I get a NullPointerException.
When I try to use appletviewer I get the following:
Warning:Can't read AppletViewer properties file: c:\Documents and Settings\walter88\.hotjava\properties using defaults. I/O exception while reading: c:\Program (The system cannot find the file specified).
Someone please help this 'newbie'.
Thanks.

Thanks for your reply. here is the applet code:
package javaapplication4;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.text.DecimalFormat;
public class Main extends JFrame
    implements ActionListener {
    private JButton button;
    public static void main(String[] args) {
        Main frame = new Main();
        frame.setSize(400, 300);
        frame.createGUI();
        frame.setVisible(true);
    private void createGUI() {
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        Container window = getContentPane();
        window.setLayout(new FlowLayout() );
        button = new JButton("Press me");
        window.add(button);
        button.addActionListener(this);
    public void actionPerformed(ActionEvent event) {
        DecimalFormat df1 = new DecimalFormat( "#####.0000");
        String Od, Length, Weight, Density;
     double od, length, weight, density, const_1, const_2, or, wall;
     Od = JOptionPane.showInputDialog("Enter OD of tubing (inch)");
     Length = JOptionPane.showInputDialog("Enter length (inch)");
     Weight = JOptionPane.showInputDialog("Enter weight (grams)");
     Density = JOptionPane.showInputDialog("Enter density (lbs/in3)");
     od = Double.parseDouble( Od );
     length = Double.parseDouble( Length );
     weight = Double.parseDouble( Weight );
     density = Double.parseDouble( Density );
     or = .5 * od;
     const_1 = 3.14159 * 453.59 * density * length;
     const_2 = -4 * const_1 * or;
     wall = (-const_2 - Math.sqrt(const_2 * const_2 - 4 * const_1 * weight))/(2 * const_1);
        JOptionPane.showMessageDialog(null, "Wall thickness is: " + df1.format(wall) + " inch");
}

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StringBuffer buffer;
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<body>
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<br>
<OBJECT classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
WIDTH = 200 HEIGHT = 200 >
<PARAM NAME = CODE VALUE = "hello.class" >
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</html>
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Best regards,
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I Thank you all for your solutions.
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