IXMLDOMDocumentPtr instance destruction

 I have created an instance of IXMLDOMDocumentPtr
//Create DOM Instance
HRESULT hResult =
m_plDomDocument.CreateInstance(MSXML2::CLSID_DOMDocument);
if (FAILED(hResult)||(NULL == m_plDomDocument))
{
             bRet = FALSE;
            LEAVE_BLOCK
}

After this line gets executed the Handle count ( In Task Manager) gets
incremented by 18 ( from 237 to 255). The handle count never gets
decremented even after I come out of the dll.

How can I release or destroy the DOM instances in the destructor. Is
there any alternate way to bring the handle count back to where its
started.

I would greatly appreciate if some one help me out.

Here is the function
bool CJobXMLParser::InitXMLFile(const string& strFilename)
{
    bool bRet = TRUE;

    BEGIN_BLOCK
        if (NULL != m_plDomDocument)
        {
            CloseXMLFile();
        }
        m_szFolderName = "";
        m_szSubFolderName = "";

        m_szFileName = strFilename.c_str();

        // convert xml file name string to something COM can handle (BSTR)
        _bstr_t bstrFileName(m_szFileName);

        //Create DOM Instance
        HRESULT hResult =
m_plDomDocument.CreateInstance(MSXML2::CLSID_DOMDocument);
        if (FAILED(hResult)||(NULL == m_plDomDocument))
        {
             bRet = FALSE;
             LEAVE_BLOCK
        }
        // call the IXMLDOMDocumentPtr's load() to load the XML document
        //variant_t vResult;
        _variant_t vtFileName(_bstr_t(strFilename.c_str()));
        bRet = m_plDomDocument->load(vtFileName);

        // success!
        if (bRet)
        {
             // Initialize the root pointer
             m_pDocRoot = m_plDomDocument->documentElement;
             if(NULL == m_pDocRoot)
             {
                bRet = FALSE;
                LEAVE_BLOCK
             }
        }

        END_BLOCK
    return bRet;
}