diff --git a/src/NzbDrone.App.Test/NzbDroneProcessServiceFixture.cs b/src/NzbDrone.App.Test/NzbDroneProcessServiceFixture.cs
index e204713fb..0c792f0c3 100644
--- a/src/NzbDrone.App.Test/NzbDroneProcessServiceFixture.cs
+++ b/src/NzbDrone.App.Test/NzbDroneProcessServiceFixture.cs
@@ -34,7 +34,7 @@ namespace NzbDrone.App.Test
                 });
 
 
-            Subject.EnforceSingleInstance();
+            Subject.PreventStartIfAlreadyRunning();
 
 
             Mocker.GetMock<IBrowserService>().Verify(c => c.LaunchWebUI(), Times.Never());
@@ -59,7 +59,7 @@ namespace NzbDrone.App.Test
 
 
 
-            Assert.Throws<TerminateApplicationException>(() => Subject.EnforceSingleInstance());
+            Assert.Throws<TerminateApplicationException>(() => Subject.PreventStartIfAlreadyRunning());
             Mocker.GetMock<IBrowserService>().Verify(c => c.LaunchWebUI(), Times.Once());
             ExceptionVerification.ExpectedWarns(1);
         }
@@ -83,7 +83,7 @@ namespace NzbDrone.App.Test
 
 
 
-            Assert.Throws<TerminateApplicationException>(() => Subject.EnforceSingleInstance());
+            Assert.Throws<TerminateApplicationException>(() => Subject.PreventStartIfAlreadyRunning());
             Mocker.GetMock<IBrowserService>().Verify(c => c.LaunchWebUI(), Times.Once());
             ExceptionVerification.ExpectedWarns(1);
         }
diff --git a/src/NzbDrone.Common/ConsoleService.cs b/src/NzbDrone.Common/ConsoleService.cs
index cceeade42..9a4caad90 100644
--- a/src/NzbDrone.Common/ConsoleService.cs
+++ b/src/NzbDrone.Common/ConsoleService.cs
@@ -24,9 +24,9 @@ namespace NzbDrone.Common
             Console.WriteLine();
             Console.WriteLine("     Usage: {0} <command> ", Process.GetCurrentProcess().MainModule.ModuleName);
             Console.WriteLine("     Commands:");
-            Console.WriteLine("                 /{0} Install the application as a Windows Service ({1}).", StartupArguments.INSTALL_SERVICE, ServiceProvider.NZBDRONE_SERVICE_NAME);
-            Console.WriteLine("                 /{0} Uninstall already installed Windows Service ({1}).", StartupArguments.UNINSTALL_SERVICE, ServiceProvider.NZBDRONE_SERVICE_NAME);
-            Console.WriteLine("                 /{0} Don't open NzbDrone in a browser", StartupArguments.NO_BROWSER);
+            Console.WriteLine("                 /{0} Install the application as a Windows Service ({1}).", StartupContext.INSTALL_SERVICE, ServiceProvider.NZBDRONE_SERVICE_NAME);
+            Console.WriteLine("                 /{0} Uninstall already installed Windows Service ({1}).", StartupContext.UNINSTALL_SERVICE, ServiceProvider.NZBDRONE_SERVICE_NAME);
+            Console.WriteLine("                 /{0} Don't open NzbDrone in a browser", StartupContext.NO_BROWSER);
             Console.WriteLine("                 <No Arguments>  Run application in console mode.");
         }
 
diff --git a/src/NzbDrone.Common/Processes/ProcessProvider.cs b/src/NzbDrone.Common/Processes/ProcessProvider.cs
index 30e120828..785b029e5 100644
--- a/src/NzbDrone.Common/Processes/ProcessProvider.cs
+++ b/src/NzbDrone.Common/Processes/ProcessProvider.cs
@@ -20,6 +20,7 @@ namespace NzbDrone.Common.Processes
         void WaitForExit(Process process);
         void SetPriority(int processId, ProcessPriorityClass priority);
         void KillAll(string processName);
+        void Kill(int processId);
         bool Exists(string processName);
         ProcessPriorityClass GetCurrentProcessPriority();
         Process Start(string path, string args = null, Action<string> onOutputDataReceived = null, Action<string> onErrorDataReceived = null);
@@ -254,7 +255,7 @@ namespace NzbDrone.Common.Processes
             return process.Modules.Cast<ProcessModule>().FirstOrDefault(module => module.ModuleName.ToLower().EndsWith(".exe")).FileName;
         }
 
-        private void Kill(int processId)
+        public void Kill(int processId)
         {
             var process = Process.GetProcesses().FirstOrDefault(p => p.Id == processId);
 
diff --git a/src/NzbDrone.Host/Bootstrap.cs b/src/NzbDrone.Host/Bootstrap.cs
index a11a848ec..952e9c17e 100644
--- a/src/NzbDrone.Host/Bootstrap.cs
+++ b/src/NzbDrone.Host/Bootstrap.cs
@@ -47,7 +47,7 @@ namespace NzbDrone.Host
             }
             catch (TerminateApplicationException e)
             {
-                Logger.Info("Application has been terminated. Reason " + e.Reason);
+                Logger.Info(e.Message);
             }
         }
 
@@ -56,7 +56,7 @@ namespace NzbDrone.Host
         {
             if (!IsInUtilityMode(applicationModes))
             {
-                EnsureSingleInstance();
+                EnsureSingleInstance(applicationModes == ApplicationModes.Service);
             }
 
             DbFactory.RegisterDatabase(_container);
@@ -78,9 +78,18 @@ namespace NzbDrone.Host
             }
         }
 
-        private static void EnsureSingleInstance()
+        private static void EnsureSingleInstance(bool isService)
         {
-            _container.Resolve<ISingleInstancePolicy>().EnforceSingleInstance();
+            var instancePolicy = _container.Resolve<ISingleInstancePolicy>();
+
+            if (isService)
+            {
+                instancePolicy.KillAllOtherInstance();
+            }
+            else
+            {
+                instancePolicy.PreventStartIfAlreadyRunning();
+            }
         }
 
 
diff --git a/src/NzbDrone.Host/NzbDroneProcessService.cs b/src/NzbDrone.Host/NzbDroneProcessService.cs
index 3ee601f84..c13a46f5b 100644
--- a/src/NzbDrone.Host/NzbDroneProcessService.cs
+++ b/src/NzbDrone.Host/NzbDroneProcessService.cs
@@ -1,4 +1,6 @@
-using System.Linq;
+using System;
+using System.Collections.Generic;
+using System.Linq;
 using NLog;
 using NzbDrone.Common.Processes;
 
@@ -6,7 +8,8 @@ namespace NzbDrone.Host
 {
     public interface ISingleInstancePolicy
     {
-        void EnforceSingleInstance();
+        void PreventStartIfAlreadyRunning();
+        void KillAllOtherInstance();
     }
 
     public class SingleInstancePolicy : ISingleInstancePolicy
@@ -22,7 +25,7 @@ namespace NzbDrone.Host
             _logger = logger;
         }
 
-        public void EnforceSingleInstance()
+        public void PreventStartIfAlreadyRunning()
         {
             if (IsAlreadyRunning())
             {
@@ -32,16 +35,34 @@ namespace NzbDrone.Host
             }
         }
 
+        public void KillAllOtherInstance()
+        {
+            foreach (var processId in GetOtherNzbDroneProcessIds())
+            {
+                _processProvider.Kill(processId);
+            }
+        }
+
         private bool IsAlreadyRunning()
+        {
+            return GetOtherNzbDroneProcessIds().Any();
+        }
+
+        private List<int> GetOtherNzbDroneProcessIds()
         {
             var currentId = _processProvider.GetCurrentProcess().Id;
-            var consoleIds = _processProvider.FindProcessByName(ProcessProvider.NZB_DRONE_CONSOLE_PROCESS_NAME).Select(c => c.Id);
-            var guiIds = _processProvider.FindProcessByName(ProcessProvider.NZB_DRONE_PROCESS_NAME).Select(c => c.Id);
+            var consoleIds = _processProvider.FindProcessByName(ProcessProvider.NZB_DRONE_CONSOLE_PROCESS_NAME)
+                .Select(c => c.Id);
+            var winformIds = _processProvider.FindProcessByName(ProcessProvider.NZB_DRONE_PROCESS_NAME).Select(c => c.Id);
 
-            var otherProcesses = consoleIds.Union(guiIds).Except(new[] { currentId });
+            var otherProcesses = consoleIds.Union(winformIds).Except(new[] { currentId }).ToList();
 
-            return otherProcesses.Any();
-        }
+            if (otherProcesses.Any())
+            {
+                _logger.Info("{0} instance(s) of NzbDrone are running", otherProcesses.Count);
+            }
 
+            return otherProcesses;
+        }
     }
 }
\ No newline at end of file
diff --git a/src/NzbDrone.Host/TerminateApplicationException.cs b/src/NzbDrone.Host/TerminateApplicationException.cs
index ad703ca18..734fb65d2 100644
--- a/src/NzbDrone.Host/TerminateApplicationException.cs
+++ b/src/NzbDrone.Host/TerminateApplicationException.cs
@@ -5,10 +5,8 @@ namespace NzbDrone.Host
     public class TerminateApplicationException : ApplicationException
     {
         public TerminateApplicationException(string reason)
+            : base("Application is being terminated. Reason : " + reason)
         {
-            Reason = reason;
         }
-
-        public string Reason { get; private set; }
     }
 }
\ No newline at end of file