Why does my code work on Windows XP but not in Windows Server 2003 ?

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Hello there guys.

The reason why I am building this tool, is just so that every one logged into windows 2003 can chat at work, about business, customers etc etc.

The tool works 100% in windows XP.
and 90% on windows server..

This is what the tool does...

Sends Message, changes string from 1 to 0... Timmer checks, if string = zero, && window is not active, notification window appears.

well...

in windows 2003, everything works , except the notification window doesnt appear.

Maybe im doing something not compatible...

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Timers;
using System.IO;
//using System.Drawing;

   
namespace CC
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            
        }

        //public string BalloonTipText;



        private void SetBalloonTip()
        {
            notifyIcon1.Icon = SystemIcons.Asterisk;
            notifyIcon1.BalloonTipTitle = "NEW MESSAGE";
            notifyIcon1.BalloonTipText = "A new message has arrived.";
            notifyIcon1.BalloonTipIcon = ToolTipIcon.Info;
            //this.Click += new EventHandler(Form1_Click);
            //this.Activated += new EventHandler(Form1_Click);
            //Form1_Click(EventArgs e);
            _showmenu();
        }

        void _showmenu()
        {
            notifyIcon1.Visible = true;
            notifyIcon1.ShowBalloonTip(10000);
        
        }
        void Form1_Click(object sender, EventArgs e)
        {
            notifyIcon1.Visible = true;
            notifyIcon1.ShowBalloonTip(5000);

        }
        


        //Ok lets do this...

        private static System.Timers.Timer TT1;
        private static System.Timers.Timer TT2;
        private static System.Timers.Timer TT3;
        private static System.Timers.Timer TT4;
        
        string _nmsg ="0";
        


       

        private void Form1_Load(object sender, EventArgs e)
        {

            try
            {
                TT3 = new System.Timers.Timer(5000);
                TT3.Elapsed += new ElapsedEventHandler(_event3);
                TT3.Interval = 5000;
                TT3.Enabled = true;
            }
            catch
            {
            }
           /* try
            {
                TT4 = new System.Timers.Timer(5000);
                TT4.Elapsed += new ElapsedEventHandler(_event4);
                TT4.Interval = 2;
                TT4.Enabled = true;
            }
            catch
            {
            }
            */




            try
            {
                TT1 = new System.Timers.Timer(5000);
                TT1.Elapsed += new ElapsedEventHandler(_event1);
                TT1.Interval = 5000;
                TT1.Enabled = true;
            }
            catch
            {
            }

            try
            {
                TT2 = new System.Timers.Timer(5000);
                TT2.Elapsed += new ElapsedEventHandler(_event2);
                TT2.Interval = 5000;
                TT2.Enabled = true;

            }
            catch
            {
            }
        }
        private void BTNclose_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void Form1_Resize(object sender, System.EventArgs e)
        {
            if (FormWindowState.Minimized == WindowState)
                Hide();
        }

        private void notifyIcon1_DoubleClick(object sender,
                                     System.EventArgs e)
        {
            Show();
            WindowState = FormWindowState.Normal;
        }
        public void _event3(object source, ElapsedEventArgs e)
        {

            try
            {                
                this.EndInvoke(this.BeginInvoke(new MethodInvoker(delegate()
                    {
                        StreamReader xcheck = new StreamReader("xcheck2.txt");
                        TBnmsg.Text = xcheck.ReadToEnd();
                        xcheck.Close();
                        _nmsg = TBnmsg.Text;
                    })));
            }
                catch
            {
            }
                if (_nmsg == "0")
                {
                    if (Form.ActiveForm == this)
                    {
                        
                    }
                    else
                    {
                        SetBalloonTip();

                    }

                    try
                    {
                        this.EndInvoke(this.BeginInvoke(new MethodInvoker(delegate()
                            {
                                /*   StreamWriter streamwriter2;
                                   streamwriter2 = File.CreateText("xcheck.txt");
                                   streamwriter2.WriteLine("0");
                                   streamwriter2.Close();*/

                                String strFile = File.ReadAllText("xcheck2.txt");
                                strFile = strFile.Replace("0", "1");
                                File.WriteAllText("xcheck2.txt", strFile);
                            })));
                    }
                    catch
                    {
                    }
                }
                else
                {
                }
                
        }

        public void _event4(object source, ElapsedEventArgs e)
        {
        }

        public void _event1(object source, ElapsedEventArgs e)
        {
            try
            {

                this.EndInvoke(this.BeginInvoke(new MethodInvoker(delegate()
                {
                    StreamReader STNEXUS = new StreamReader("quadaxial.txt");
                    TBnexus.Text = STNEXUS.ReadToEnd();
                    STNEXUS.Close();

                    //move the caret to the end of the text
                    TBnexus.SelectionStart = TBnexus.TextLength;
                    //scroll to the caret
                    TBnexus.ScrollToCaret();

                })));



            }
            catch
            {
            }
                

            }
            
      
        string _user = Environment.UserName;
         
        

        public void _event2(object source, ElapsedEventArgs e)
        {
           
        }

    

        private void tb_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Enter)
            {
                

                _enter();
            }
        }

        private void _enter()
        {
            
            if (TBmessage.Text != "")
            {

                try
                {
                    this.EndInvoke(this.BeginInvoke(new MethodInvoker(delegate()
                {
                    String strFile = File.ReadAllText("xcheck2.txt");
                    strFile = strFile.Replace("1", "0");
                    File.WriteAllText("xcheck2.txt", strFile);
                })));
                }
                catch
                { }

                try
                {
                    this.EndInvoke(this.BeginInvoke(new MethodInvoker(delegate()
                    {
                        StreamWriter streamwriter;
                        streamwriter = File.AppendText("quadaxial.txt");
                        streamwriter.WriteLine(_user + ": " + TBmessage.Text + "\r\n");
                        streamwriter.Close();
                        TBmessage.Text = "";

                    })));
                }
                catch
                {
                }
            }

            else
            {
                MessageBox.Show("No message to send,Message Box is EMPTY");
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
           /* this.EndInvoke(this.BeginInvoke(new MethodInvoker(delegate()
                           {
                               StreamWriter streamwriter2;
                               streamwriter2 = File.AppendText("xcheck2.txt");
                               streamwriter2.WriteLine("0");
                               streamwriter2.Close();
                           })));*/
            
            _enter();

            
        }

        private void button2_Click(object sender, EventArgs e)
        {
            
StreamReader streamreader1 = new StreamReader("quadaxial.txt");
TBhistory.Text  = streamreader1.ReadToEnd();
streamreader1.Close();

            panel2.Visible = true;
            BTNback.Visible = true;
            BTNclose.Visible = false;
            panel1.Visible = false;
        }

        private void BTNback_Click(object sender, EventArgs e)
        {
            panel2.Visible = false;
            BTNback.Visible = false;
            BTNclose.Visible = true;
            panel1.Visible = true;
        }
        
    }
}