uninstall and hide Windows Update

how to uninstall and hide windows update?

That is my function to hide updates from Windows Update:

void UpdateManager::HideUpdate(String updateNumber /* typedef std::wstring String; */)
{
    HRESULT hr = CoInitialize(NULL);

    IUpdateSession* iUpdate;
    IUpdateSearcher* searcher;
    ISearchResult* results;
    BSTR criteria = SysAllocString(L"IsInstalled=0 and Type='Software'");

    hr = CoCreateInstance(CLSID_UpdateSession, NULL, CLSCTX_INPROC_SERVER, IID_IUpdateSession, (LPVOID*)&iUpdate);
    hr = iUpdate->CreateUpdateSearcher(&searcher);

    hr = searcher->Search(criteria, &results);
    SysFreeString(criteria);

    switch (hr)
    {
    case S_OK:
        break;
    case WU_E_LEGACYSERVER:
        return;
    case WU_E_INVALID_CRITERIA:
        return;
    }


    IUpdateCollection *updateList;
    IUpdate *updateItem;
    LONG updateSize;
    BSTR updateName;
    DATE retdate;

    results->get_Updates(&updateList);
    updateList->get_Count(&updateSize);

    for (LONG i = 0; i < updateSize; i++)
    {
        updateList->get_Item(i, &updateItem);
        updateItem->get_Title(&updateName);
        updateItem->get_LastDeploymentChangeTime(&retdate);
        COleDateTime odt;
        odt.m_dt = retdate;
        if (updateName == updateNumber)
        {
            updateItem->put_IsHidden(TRUE);
        }
    }
    ::CoUninitialize();
}

not working =( Updates do not hide from Windows Update I looked at MSDN, but could not do anything. Help to implement a normal code.