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Recently in comments from users of Windows 10 appeared the error message 0x80070091 when you use the restore points — system Restore did not complete successfully. Crashing when restoring a directory from the restore point. Source: AppxStaging, unexpected error when system restore 0x80070091.
Not without the help of commentators failed to understand how error occurs and how to fix it, which will be discussed in this manual. Cm. also:.
Note: in theory, the below-described steps can lead to undesirable results, therefore, use this guide only if you are prepared that something can go wrong and cause additional errors in Windows 10.
Error correction 0x800070091
Specified unexpected error occurred during system restore when problems arise (after you upgrade to Windows 10, or in other situations) with the contents and registration of the applications in the folder Program Files WindowsApps.
The path of correction is quite simple — delete this folder and start a rollback from a recovery point again.
However, just delete the folder WindowsApps won’t work and, moreover, just in case, better not to delete it immediately, and temporarily rename, for example, in WindowsApps.old and in the future, if the error 0x80070091 is corrected, delete the renamed copy of the folder.
Upon completion, verify that you can use restore points. Likely to error 0x80070091 will not manifest itself again, and after a successful recovery process you can delete the folder WindowsApps.old (this will ensure that there is a new WindowsApps folder in the same location).
This completed, I hope the manual will be useful, and for the proposed solution to thank the reader Tatyana.