请教:Win98 下 在进程间调用COM接口失败

Question

接口的实现(在一个单独的进程中启动(SINGLETON)):
STDMETHODIMP CInstallImp::RegisterEventHandler(IUnknown* piSinkInterface, DWORD* phHandle)
{
    return Advise(piSinkInterface, phHandle);
}
=========================================
客户端调用代码:
    m_pInstallServiceEventHandler = new CInstallServiceEventHandler(this);
    IUnknown* pSinkUnknown;
    HRESULT hr = m_pInstallServiceEventHandler->QueryInterface(IID_IUnknown, (void**)&pSinkUnknown);
if (SUCCEEDED(hr))
{
m_pInstall->RegisterEventHandler(pSinkUnknown, &m_dwCookie);
         pSinkUnknown->Release();
}在执行m_pInstall->RegisterEventHandler(pSinkUnknown, &m_dwCookie);时程序崩溃, 错误信息为"InstallService.exe caused an invalid page fault in module RPCRT4.DLL".该代码在WIN2K下运行正常
SYSTEM INFO: Dell, 1.8GHz, 512Mb, Win98 2nd, IE6.0 SP1.请高手指点.