Improved the error diagnosis, after seeing http://www.nabble.com/error-installing-hudson-as-a-windows-service-tt21378003.html

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@14315 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/Util.java

@@ -323,6 +323,17 @@ public class Util {
         return null; // no message
     }
 
+    /**
+     * Gets a human readable mesasge for the given Win32 error code.
+     *
+     * @return
+     *      null if no such message is available.
+     */
+    public static String getWin32ErrorMessage(int n) {
+        ResourceBundle rb = ResourceBundle.getBundle("/hudson/win32errors");
+        return rb.getString("error"+n);
+    }
+
     /**
      * Guesses the current host name.
      */