diff --git a/shadowsocks-csharp/Data/cn.txt b/shadowsocks-csharp/Data/cn.txt
index b4c7a6ee..751d1101 100644
--- a/shadowsocks-csharp/Data/cn.txt
+++ b/shadowsocks-csharp/Data/cn.txt
@@ -19,6 +19,7 @@ Update Local PAC from GFWList=从 GFWList 更新本地 PAC
 Edit User Rule for GFWList...=编辑 GFWList 的用户规则...
 Show QRCode...=显示二维码...
 Scan QRCode from Screen...=扫描屏幕上的二维码...
+Availability Statistics=统计可用性
 Show Logs...=显示日志...
 About...=关于...
 Quit=退出
@@ -72,6 +73,9 @@ Failed to update PAC file =更新 PAC 文件失败
 PAC updated=更新 PAC 成功
 No updates found. Please report to GFWList if you have problems with it.=未发现更新。如有问题请提交给 GFWList。
 No QRCode found. Try to zoom in or move it to the center of the screen.=未发现二维码，尝试把它放大或移动到靠近屏幕中间的位置
+Shadowsocks is already running.=Shadowsocks 已经在运行。
+Find Shadowsocks icon in your notify tray.=请在任务栏里寻找 Shadowsocks 图标。
+If you want to start multiple Shadowsocks, make a copy in another directory.=如果想启动多份，可以另外复制一份到别的目录。
 Failed to decode QRCode=无法解析二维码
 Failed to update registry=无法修改注册表
 System Proxy On: =系统代理已启用：
diff --git a/shadowsocks-csharp/Program.cs b/shadowsocks-csharp/Program.cs
index 8ca485d7..f840106a 100755
--- a/shadowsocks-csharp/Program.cs
+++ b/shadowsocks-csharp/Program.cs
@@ -19,7 +19,7 @@ namespace Shadowsocks
         static void Main()
         {
             Util.Utils.ReleaseMemory();
-            using (Mutex mutex = new Mutex(false, "Global\\" + "71981632-A427-497F-AB91-241CD227EC1F"))
+            using (Mutex mutex = new Mutex(false, "Global\\Shadowsocks_" + Application.StartupPath.GetHashCode()))
             {
                 Application.EnableVisualStyles();
                 Application.SetCompatibleTextRenderingDefault(false);
@@ -31,7 +31,9 @@ namespace Shadowsocks
                     {
                         Process oldProcess = oldProcesses[0];
                     }
-                    MessageBox.Show("Shadowsocks is already running.\n\nFind Shadowsocks icon in your notify tray.");
+                    MessageBox.Show(I18N.GetString("Find Shadowsocks icon in your notify tray.") + "\n" +
+                        I18N.GetString("If you want to start multiple Shadowsocks, make a copy in another directory."),
+                        I18N.GetString("Shadowsocks is already running."));
                     return;
                 }
                 Directory.SetCurrentDirectory(Application.StartupPath);