Eu altamente recomendaria não usando o msizap no seu computador. A Microsoft retirou o Utilitário de Limpeza do Windows Installer, que incluía o msizap. Consulte o kb2438651 da Microsoft para obter mais informações, especificamente esta parte do artigo kb:
Important: The Windows Installer Cleanup utility (MSICUU2.exe) that was previously referred to in this article has been retired. While the Windows Installer Cleanup utility resolved some installation problems, it sometimes damaged other components installed on the computer. Because of this, the tool has been removed from the Microsoft Download Center. The Program Install and Uninstall troubleshooter is a replacement for that utility.