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

INTRODUCTION

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)