diff --git a/shadowsocks-csharp/Controller/AutoStartup.cs b/shadowsocks-csharp/Controller/AutoStartup.cs
index b2c64ea31a..0849fb4a56 100644
--- a/shadowsocks-csharp/Controller/AutoStartup.cs
+++ b/shadowsocks-csharp/Controller/AutoStartup.cs
@@ -1,13 +1,13 @@
-using System;
+using Microsoft.Win32;
+using System;
 using System.Windows.Forms;
-using Microsoft.Win32;
 
 namespace Shadowsocks.Controller
 {
     class AutoStartup
     {
         static string Key = "ShadowsocksR_" + Application.StartupPath.GetHashCode();
-        static string RegistryRunPath = (IntPtr.Size == 4 ? @"Software\Microsoft\Windows\CurrentVersion\Run" : @"SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run");
+        static string RegistryRunPath = @"Software\Microsoft\Windows\CurrentVersion\Run";
 
         public static bool Set(bool enabled)
         {
@@ -15,7 +15,7 @@ public static bool Set(bool enabled)
             try
             {
                 string path = Util.Utils.GetExecutablePath();
-                runKey = Registry.LocalMachine.OpenSubKey(RegistryRunPath, true);
+                runKey = Util.Utils.OpenRegKey(RegistryRunPath, true);
                 if (enabled)
                 {
                     runKey.SetValue(Key, path);
@@ -55,7 +55,7 @@ public static bool Switch()
             try
             {
                 string path = Util.Utils.GetExecutablePath();
-                runKey = Registry.LocalMachine.OpenSubKey(RegistryRunPath, true);
+                runKey = Util.Utils.OpenRegKey(RegistryRunPath, true);
                 if (enabled)
                 {
                     runKey.SetValue(Key, path);
@@ -93,8 +93,7 @@ public static bool Check()
             RegistryKey runKey = null;
             try
             {
-                string path = Util.Utils.GetExecutablePath();
-                runKey = Registry.LocalMachine.OpenSubKey(RegistryRunPath, false);
+                runKey = Util.Utils.OpenRegKey(RegistryRunPath, false);
                 string[] runList = runKey.GetValueNames();
                 runKey.Close();
                 foreach (string item in runList)
diff --git a/shadowsocks-csharp/Controller/UpdateChecker.cs b/shadowsocks-csharp/Controller/UpdateChecker.cs
index 4fe189b523..9dadc0d612 100755
--- a/shadowsocks-csharp/Controller/UpdateChecker.cs
+++ b/shadowsocks-csharp/Controller/UpdateChecker.cs
@@ -22,7 +22,7 @@ public class UpdateChecker
 
         public const string Name = @"ShadowsocksR";
         public const string Copyright = @"Copyright © BreakWa11 2017. Fork from Shadowsocks by clowwindy";
-        public const string Version = @"4.9.0";
+        public const string Version = @"4.9.1";
 #if !_DOTNET_4_0
         public const string NetVer = @"2.0";
 #elif !_CONSOLE
diff --git a/shadowsocks-csharp/Util/Util.cs b/shadowsocks-csharp/Util/Util.cs
index 22c3240661..d5bcd232f5 100755
--- a/shadowsocks-csharp/Util/Util.cs
+++ b/shadowsocks-csharp/Util/Util.cs
@@ -1,4 +1,8 @@
-using System;
+using Microsoft.Win32;
+using OpenDNS;
+using Shadowsocks.Controller;
+using Shadowsocks.Model;
+using System;
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Drawing;
@@ -6,15 +10,9 @@
 using System.IO.Compression;
 using System.Net;
 using System.Net.Sockets;
-using System.Reflection;
 using System.Runtime.InteropServices;
 using System.Security.Cryptography;
-using System.Text;
 using System.Windows.Forms;
-using OpenDNS;
-using Shadowsocks.Controller;
-using Shadowsocks.Encryption;
-using Shadowsocks.Model;
 
 namespace Shadowsocks.Util
 {
@@ -456,6 +454,14 @@ public static string GetExecutablePath()
             return System.Reflection.Assembly.GetExecutingAssembly().Location;
         }
 
+        public static RegistryKey OpenRegKey(string name, bool writable, RegistryHive hive = RegistryHive.CurrentUser)
+        {
+            var userKey = RegistryKey.OpenBaseKey(hive,
+                            Environment.Is64BitProcess ? RegistryView.Registry64 : RegistryView.Registry32)
+                    .OpenSubKey(name, writable);
+            return userKey;
+        }
+
         public static int RunAsAdmin(string Arguments)
         {
             Process process = null;