diff --git a/core/pom.xml b/core/pom.xml
index f5d20f524e..e3662c71bc 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -461,6 +461,11 @@
       <artifactId>commons-collections</artifactId>
       <version>3.2</version>
     </dependency>
+    <dependency>
+      <groupId>org.jvnet.winp</groupId>
+      <artifactId>winp</artifactId>
+      <version>1.1</version>
+    </dependency>
     <dependency>
       <groupId>com.octo.captcha</groupId>
       <artifactId>jcaptcha-all</artifactId>
diff --git a/core/src/main/java/hudson/Launcher.java b/core/src/main/java/hudson/Launcher.java
index d74dec2f95..92cc6125f8 100644
--- a/core/src/main/java/hudson/Launcher.java
+++ b/core/src/main/java/hudson/Launcher.java
@@ -21,6 +21,8 @@ import java.io.BufferedOutputStream;
 import java.util.Map;
 import java.util.Arrays;
 
+import org.jvnet.winp.WinProcess;
+
 /**
  * Starts a process.
  *
@@ -310,7 +312,10 @@ public abstract class Launcher {
                  */
                 protected synchronized void terminate(IOException e) {
                     super.terminate(e);
-                    proc.destroy();
+                    if(Hudson.isWindows())
+                        new WinProcess(proc).killRecursively();
+                    else
+                        proc.destroy();
                 }
 
                 public synchronized void close() throws IOException {
diff --git a/core/src/main/java/hudson/Proc.java b/core/src/main/java/hudson/Proc.java
index 3fc4a153ee..ade8c56323 100644
--- a/core/src/main/java/hudson/Proc.java
+++ b/core/src/main/java/hudson/Proc.java
@@ -3,6 +3,7 @@ package hudson;
 import hudson.remoting.Channel;
 import hudson.util.IOException2;
 import hudson.util.StreamCopyThread;
+import hudson.model.Hudson;
 
 import java.io.File;
 import java.io.IOException;
@@ -14,6 +15,8 @@ import java.util.concurrent.Future;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
+import org.jvnet.winp.WinProcess;
+
 /**
  * External process wrapper.
  *
@@ -144,17 +147,27 @@ public abstract class Proc {
                 return r;
             } catch (InterruptedException e) {
                 // aborting. kill the process
-                proc.destroy();
+                destroy();
                 throw e;
             }
         }
 
         @Override
         public void kill() throws InterruptedException, IOException {
-            proc.destroy();
+            destroy();
             join();
         }
 
+        /**
+         * Destroys the child process without join.
+         */
+        private void destroy() {
+            if(Hudson.isWindows())
+                new WinProcess(proc).killRecursively();
+            else
+                proc.destroy();
+        }
+
         private static class ByteCopier extends Thread {
             private final InputStream in;
             private final OutputStream out;
diff --git a/core/src/main/java/hudson/model/Slave.java b/core/src/main/java/hudson/model/Slave.java
index 5c4a9ccc34..c6850eb3ba 100644
--- a/core/src/main/java/hudson/model/Slave.java
+++ b/core/src/main/java/hudson/model/Slave.java
@@ -17,6 +17,7 @@ import hudson.tasks.LabelFinder;
 import hudson.util.*;
 import org.kohsuke.stapler.StaplerRequest;
 import org.kohsuke.stapler.StaplerResponse;
+import org.jvnet.winp.WinProcess;
 
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletResponse;
@@ -315,7 +316,10 @@ public final class Slave implements Node, Serializable {
                                 public void onClosed(Channel channel, IOException cause) {
                                     if(cause!=null)
                                         cause.printStackTrace(listener.error("%s slave agent was terminated\n",getTimestamp()));
-                                    proc.destroy();
+                                    if(Hudson.isWindows())
+                                        new WinProcess(proc).killRecursively();
+                                    else
+                                        proc.destroy();
                                 }
                             });