clearing a bad word in a global setting

I have a class that checks for bad words - on pressing the enter key or the button in the application it is running in it throws an alert that says it is a bad word. now this is global so any app running- like notepad - if you are typing a bad word in is effected by it-  how do I clear that bad word or change the bad word to hash marks (####)

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.Diagnostics;
using System.Management;
using System.Xml;
using System.Xml.Schema;
using System.IO;
using System.Security;
using System.Runtime.InteropServices;


namespace Nomad
{
    public partial class frmMain : Form
    {
        BadWordFilter newBadwordFilter;
       
        public frmMain()
        {
            InitializeComponent();
            comboBox1.SelectedIndex = 0;
            newBadwordFilter = BadWordFilter.Instance;
            InterceptKeys.AttachHook(); <- this starts the bad word process
            //bool a = which one
            //a = newBadwordFilter.IsCleanString("Fuck");//to check
            //a = newBadwordFilter.IsCleanString("Duck");//to check
            int c = 0;
           


        }
       
   



        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            webBrowser1.Navigate(new Uri(comboBox1.SelectedItem.ToString()));

        }

        private void btnStartLP_Click(object sender, EventArgs e)
        {

            var proc = new Process();
            proc.StartInfo.FileName = "chat/chat.exe";
            proc.StartInfo.Arguments = "-v -s -a";
            proc.Start();
            proc.WaitForExit();
            var exitCode = proc.ExitCode;
            proc.Close();
        }
        ///////////////////////////////Knowledge  Base//////////////////
        /// <summary>
        /// Question answer Pair
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        ///
        private void btnSearchKnowledge_Click(object sender, EventArgs e)
        {
            char[] delimiters = new char[] { ',', ' ' };
            string[] keywords = txtBoxKnowledgeQuestion.Text.Split(delimiters, StringSplitOptions.RemoveEmptyEntries);

            XmlDocument doc = new XmlDocument();
            doc.Load("XMLQandA.xml");

            XmlElement root = doc.DocumentElement;

            XmlNodeList nodeList = root.SelectNodes("/messages/messageItem");

            foreach (XmlNode node in nodeList)
            {
                bool hasAllWords = true;
                bool hasAnyWord = false;
                foreach (string keyword in keywords)
                {
                    if (node.InnerText.Contains(keyword))
                    {
                        hasAnyWord = true;
                    }
                    else hasAllWords = false;
                }


                if (hasAllWords)
                {
                    // add the node to found-items-list        
                    lstBoxQA.Items.Add(node.InnerText);
                    lstBoxQA.Items.Add("======================");
                    //lstBoxQA.Items.AddRange(node.InnerText);
                    return;

                }
                if (hasAnyWord)
                {
                   

                    //process found-items-list
                    lstBoxQA.Items.Add(node.InnerText);
                    lstBoxQA.Items.Add("======================");
                    //lstBoxQA.Items.AddRange(node.InnerText);
                   
                }
                               

               

            }
            //frmWarning frm = new frmWarning();
            //frm.Show();
            MessageBox.Show("You have typed a word that has been deemed \n inapropriate - it will be blanked out - Next time an email \n will be sent to HR and IT to have your access cut off"); <-this is the test area          
            int c = 1;
        }

        private void btnEVid_Click(object sender, EventArgs e)
        {
            webBEVid.Navigate(new Uri("http://172.0.0.1//Login.aspx"));
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void btnLogon_Click(object sender, EventArgs e)
        {
           
           
        }

        private void frmMain_Load(object sender, EventArgs e)
        {
           
        }

        private void webBrowser2_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
           
        }

        private void btnCamp_Click(object sender, EventArgs e)
        {
            webBrowser2.Navigate(new Uri("http://et2app01/Ensercle/index.htm"));
        }

        private void btnClear_Click(object sender, EventArgs e)
        {
            lstBoxQA.Items.Clear();
            txtBoxKnowledgeQuestion.Clear();
        }

        private void frmMain_FormClosing(object sender, FormClosingEventArgs e)
        {
            InterceptKeys.DetachHook(); <- this ends the bad word process
        }
       
       
    }
}