diff --git a/VietTypeConfig/Form1.cs b/VietTypeConfig/Form1.cs
index fc5173d..41f5d5d 100644
--- a/VietTypeConfig/Form1.cs
+++ b/VietTypeConfig/Form1.cs
@@ -3,17 +3,19 @@
 
 using System;
 using System.Resources;
-using System.Runtime;
 using System.Runtime.InteropServices;
 using System.Windows.Forms;
-using VietTypeConfig.Properties;
 using static VietTypeConfig.VietTypeRegistrar;
 
 namespace VietTypeConfig {
     public partial class Form1 : Form {
         private readonly ResourceManager rm = new ResourceManager(typeof(Form1));
+        private bool oobe = false;
 
-        public Form1() {
+        public Form1(string[] args) {
+            if (args.Length > 0) {
+                oobe = string.Equals(args[0], "-oobe", StringComparison.InvariantCultureIgnoreCase);
+            }
             InitializeComponent();
             udOptimizeMultilang.MouseWheel += (sender, e) => ((HandledMouseEventArgs)e).Handled = true;
         }
@@ -64,6 +66,13 @@ private void Activate(bool newState) {
             var result = newState ? ActivateProfiles() : DeactivateProfiles();
             if (result == S_OK) {
                 if (newState) {
+                    if (MessageBox.Show(rm.GetString("setDefaultQuestion"), "VietType", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes) {
+                        try {
+                            Settings.SetDefault();
+                        } catch (Exception ex) {
+                            MessageBox.Show(string.Format(rm.GetString("cannotSaveSettingsMessage"), ex.Message), "VietType", MessageBoxButtons.OK, MessageBoxIcon.Error);
+                        }
+                    }
                     MessageBox.Show(rm.GetString("enableSuccessMessage"), "VietType", MessageBoxButtons.OK, MessageBoxIcon.Information);
                 } else {
                     MessageBox.Show(rm.GetString("disableSuccessMessage"), "VietType", MessageBoxButtons.OK, MessageBoxIcon.Information);
@@ -77,7 +86,7 @@ private void Activate(bool newState) {
 
         private void Form1_Shown(object sender, EventArgs e) {
             if (IsProfileActivated() != S_OK) {
-                if (MessageBox.Show(rm.GetString("notEnabledQuestion"), "VietType", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes) {
+                if (oobe || MessageBox.Show(rm.GetString("notEnabledQuestion"), "VietType", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes) {
                     Activate(true);
                 }
             }
diff --git a/VietTypeConfig/Form1.en.resx b/VietTypeConfig/Form1.en.resx
index 34b5586..8ec874e 100644
--- a/VietTypeConfig/Form1.en.resx
+++ b/VietTypeConfig/Form1.en.resx
@@ -179,4 +179,7 @@ VietType is free software, licensed under the GNU General Public License. VietTy
   <data name="notEnabledQuestion" xml:space="preserve">
     <value>VietType is not enabled. Enable it now?</value>
   </data>
+  <data name="setDefaultQuestion" xml:space="preserve">
+    <value>Set VietType as default input method?</value>
+  </data>
 </root>
\ No newline at end of file
diff --git a/VietTypeConfig/Form1.vi.resx b/VietTypeConfig/Form1.vi.resx
index 4ccee49..9ac7b01 100644
--- a/VietTypeConfig/Form1.vi.resx
+++ b/VietTypeConfig/Form1.vi.resx
@@ -183,4 +183,7 @@ VietType là phần mềm tự do, bạn có thể cung cấp lại và/hoặc c
   <data name="lblOptimizeMultilang.Text" xml:space="preserve">
     <value>Mức tối ưu gõ nhiều ngôn ngữ (&amp;O):</value>
   </data>
+  <data name="setDefaultQuestion" xml:space="preserve">
+    <value>Đặt VietType làm bộ gõ mặc định?</value>
+  </data>
 </root>
\ No newline at end of file
diff --git a/VietTypeConfig/NativeMethods.cs b/VietTypeConfig/NativeMethods.cs
index 77e899c..349d00d 100644
--- a/VietTypeConfig/NativeMethods.cs
+++ b/VietTypeConfig/NativeMethods.cs
@@ -52,4 +52,9 @@ internal static class VietTypeRegistrar {
         [DllImport("VietTypeATL32.dll", CallingConvention = CallingConvention.Cdecl)]
         public static extern int IsProfileActivated();
     }
+
+    internal static class NativeMethods {
+        [DllImport("bcp47langs.dll", CharSet = CharSet.Unicode, SetLastError = true)]
+        public static extern int SetInputMethodOverride(string TipString);
+    }
 }
diff --git a/VietTypeConfig/Program.cs b/VietTypeConfig/Program.cs
index 92f085e..b40820f 100644
--- a/VietTypeConfig/Program.cs
+++ b/VietTypeConfig/Program.cs
@@ -12,10 +12,10 @@ internal static class Program {
         /// The main entry point for the application.
         /// </summary>
         [STAThread]
-        static void Main() {
+        static void Main(string[] args) {
             Application.EnableVisualStyles();
             Application.SetCompatibleTextRenderingDefault(false);
-            Application.Run(new Form1());
+            Application.Run(new Form1(args));
         }
     }
 }
diff --git a/VietTypeConfig/Settings.cs b/VietTypeConfig/Settings.cs
index de5cf71..115f1f4 100644
--- a/VietTypeConfig/Settings.cs
+++ b/VietTypeConfig/Settings.cs
@@ -10,6 +10,9 @@ internal class Settings : INotifyPropertyChanged {
         private const string Subkey = "Software\\VietType";
         private static readonly Guid GUID_SystemNotifyCompartment = Guid.Parse("{B2FBD2E7-922F-4996-BE77-21085B91A8F0}");
         private static readonly Guid CLSID_TF_ThreadMgr = Guid.Parse("{529a9e6b-6587-4f23-ab9e-9c7d683e3c50}");
+        private static readonly Guid CLSID_TextService = Guid.Parse("{c0dd01a1-0deb-454b-8b42-d22ced1b4b23}");
+        private static readonly Guid GUID_Profile = Guid.Parse("{8D93D10A-203B-4C5F-A122-8898EF9C56F5}");
+        private const ushort TextServiceLangId = 0x42a;
 
         bool default_enabled = false;
         public bool DefaultEnabled {
@@ -147,5 +150,9 @@ public static void SaveSettings(Settings settings) {
                 }
             }
         }
+
+        public static void SetDefault() {
+            NativeMethods.SetInputMethodOverride(string.Format("{0:X4}:{{{1}}}{{{2}}}", TextServiceLangId, CLSID_TextService.ToString(), GUID_Profile.ToString()));
+        }
     }
 }