Error message when you try to install a Windows update, a hotfix, or a service pack after you perform System Restore in Windows Vista: "0x80071A91"
KB Article: https://support.microsoft.com/kb/948252
After you perform System Restore in Windows Vista, you cannot install a Windows update, a hotfix, or a service pack. Additionally, you may receive the following error message:
80071A91 (ERROR_RM_NOT_ACTIVE)