diff --git a/src/main/java/com/loafle/overflow/crawler/wmi/WMICrawlerWindows.java b/src/main/java/com/loafle/overflow/crawler/wmi/WMICrawlerWindows.java
index 958cc07..4ee0d82 100644
--- a/src/main/java/com/loafle/overflow/crawler/wmi/WMICrawlerWindows.java
+++ b/src/main/java/com/loafle/overflow/crawler/wmi/WMICrawlerWindows.java
@@ -32,15 +32,38 @@ public class WMICrawlerWindows extends WMICrawlerOS {
         ActiveXComponent wmi = null;
         wmi = new ActiveXComponent("WbemScripting.SWbemLocator");
 
-        Variant conRet = wmi.invoke("ConnectServer", new Variant(ip), new Variant(nameSpace), new Variant(id), new Variant(pw));
+        Variant vIp = new Variant(ip);
+        Variant vNs = new Variant(nameSpace);
+        Variant vId = new Variant(id);
+        Variant vPw = new Variant(pw);
 
-        ActiveXComponent wmiconnect = new ActiveXComponent(conRet.toDispatch());
+        Variant conRet = wmi.invoke("ConnectServer", vIp, vNs, vId, vPw);
 
-        Variant vCollection = wmiconnect.invoke("ExecQuery", new Variant(query));
+        vIp.safeRelease();
+        vNs.safeRelease();
+        vId.safeRelease();
+        vPw.safeRelease();
+
+        Dispatch disConret = conRet.toDispatch();
+
+        ActiveXComponent wmiconnect = new ActiveXComponent(disConret);
+        disConret.safeRelease();
+
+        Variant vQuery = new Variant(query);
+
+        Variant vCollection = wmiconnect.invoke("ExecQuery", vQuery);
+
+        wmiconnect.safeRelease();
+        vQuery.safeRelease();
 
         EnumVariant enumVariant = new EnumVariant(vCollection.toDispatch());
 
+        wmi.safeRelease();
+        conRet.safeRelease();
+        vCollection.safeRelease();
 
+
+        Variant vItem = null;
         Dispatch item = null;
 
         List<String> columns = null;
@@ -48,7 +71,8 @@ public class WMICrawlerWindows extends WMICrawlerOS {
         List<Map<String, String>> resultMapList = new ArrayList<Map<String, String>>();
         while (enumVariant.hasMoreElements()) {
 
-            item = enumVariant.nextElement().toDispatch();
+            vItem = enumVariant.nextElement();
+            item = vItem.toDispatch();
 
             if (columns == null) {
                 columns = getColumns(item);
@@ -57,14 +81,20 @@ public class WMICrawlerWindows extends WMICrawlerOS {
             resultMap = new HashMap<String, String>();
             String name = null;
             String value = null;
+            Variant vValue = null;
 
             for(int indexI = 0 ; indexI < columns.size(); ++indexI) {
                 name = columns.get(indexI);
-                value = Dispatch.call(item, name).toString();
+                vValue = Dispatch.call(item, name);
+                value = vValue.toString();
                 resultMap.put(name, value);
+                vValue.safeRelease();
             }
 
             resultMapList.add(resultMap);
+
+            vItem.safeRelease();
+            item.safeRelease();
         }
         return resultMapList;
     }
@@ -75,17 +105,37 @@ public class WMICrawlerWindows extends WMICrawlerOS {
 
         Variant propertyesa = Dispatch.call(item, "Properties_");
 
-        Variant newEnum = Dispatch.call(propertyesa.toDispatch(), "_NewEnum");
+        Dispatch disProperty = propertyesa.toDispatch();
+
+
+        Variant newEnum = Dispatch.call(disProperty, "_NewEnum");
+
+        propertyesa.safeRelease();
+        disProperty.safeRelease();
 
         EnumVariant enumv = newEnum.toEnumVariant();
 
-        while (enumv.hasMoreElements()) {
-            Dispatch vv = enumv.nextElement().toDispatch();
+        newEnum.safeRelease();
 
-            String vs = Dispatch.call(vv, "Name").toString();
+        Variant vElem = null;
+        Dispatch disElem = null;
+        Variant vName = null;
+
+        while (enumv.hasMoreElements()) {
+            vElem = enumv.nextElement();
+            disElem = vElem.toDispatch();
+
+            vName = Dispatch.call(disElem, "Name");
+            String vs = vName.toString();
 
             columns.add(vs);
+
+            disElem.safeRelease();
+            vElem.safeRelease();
+            vName.safeRelease();
         }
+
+        enumv.safeRelease();
         return columns;
     }