Consider the following scenario:
- You install Windows 10 on a clean computer.
- You turn on system protection, and then create a system restore point that is named "R1."
- You install one or more Windows 10 updates.
- After the updates have finished installing, you restore the system to the "R1" restore point.
In this scenario, the system is not restored to the "R1" restore point. Instead, the computer experiences a Stop error (0xc000021a). You restart the computer, but the system cannot return to the Windows desktop.
This is a known issue in Windows 10.
During the system restore process, Windows temporarily stages the restoration of files that are in use. It then saves the information in the registry. When the computer restarts, it completes the staged operation.
In this situation, Windows restores the catalog files and stages the driver
.sys files to be restored when the computer restarts. However, when the computer restarts, Windows loads the existing drivers before it restores the later versions of the drivers. Because the driver versions do not match the versions of the restored catalog files, the restart process stops.
To recover from the failed restart and continue the restore process
After the failure occurs, restart the computer until it enters the Windows Recovery Environment (WinRE). To do this, you may have to use a hardware restart switch, and you may have to restart multiple times.
In the Windows Recovery Environment, follow these steps:
- Select Troubleshoot > Advanced options > More recovery options > Startup settings, and then select Restart now.
- In the list of startup settings, select Disable driver signature enforcement.
Note You may have to use the F7 key to select this setting.
- Allow the startup process to continue. As Windows restarts, the system restore process should resume and finish.
These steps restore the computer to its "R1" state.
To recover from the failed restart and roll back the restore process
- As described in the previous procedure, restart the computer and then enter WinRE.
- In the Windows Recovery Environment, select Troubleshoot > Advanced options > System restore, and then select Undo system restore.
These steps return the computer to the state that it was in before you started the restore process.
To restore Windows to a restore point by using WinRE
To start the System Restore wizard on an affected computer, use WinRE instead of the Settings dialog box. To start this process from the Windows desktop, follow these steps:
- Select Start > Settings > Update & Security > Recovery.
- Under Advanced options, select Restart now.
- After WinRE starts, select Troubleshoot > Advanced options > System restore.
- Enter your recovery key as it is shown on the screen, and then follow the instructions in the System Restore wizard.