Updating boot support
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Microsoft says that a known issue will block Windows 10 from booting after trying to restore the system to a restore point created before installing a Windows 10 update.
The issue affects all Windows machines where system protection is turned on and a system restore point has been created prior to installing one or more Windows 10 updates.
When users try to restore the system after the Windows 10 updates have finished installing, the system will not be restored and, instead, "the computer experiences a Stop error (0xc000021a)" and, after restarting the computer, the system will not be able to return to the Windows desktop.
If you're looking for previous release downloads for Microsoft Auto Update, see Update history for Office for Mac. If you previously had a one-time purchase of Office on your Mac but now are an Office 365 subscriber and aren't seeing certain subscription features, your copy of Office may still be using the license of your one-time purchase and not your subscription. To be able to circumvent the restart failures caused by this known issue, users may have to either restart two times in a row or use a hardware restart switch.Once the Windows Recovery Environment is on the screen, follow these steps: Following the steps listed above will allow users to restore the computer to the restore point chosen before the Stop error (0xc000021a) was triggered.I just finished installing all updates for my company and home and had no issues at all.I don't use System restore however so I suspect I'll never see anything related to this. I recalled a similar issue from a previous failed Win10 update and decided to try another solution.