Since Windows XP, it's possible to try to repair the startup of your computer very easily thanks to a feature called "Last Known Good Configuration".
This feature is available in the "Advanced Boot Options" menu accessed by repeatedly pressing the F8 key on your keyboard when your computer boots (before Windows starts).
However, this "Last Known Good Configuration" feature is no longer enabled by default on Windows 10 and Windows 11. In this tutorial, you will see how to re-enable this option.
For the "Advanced Boot Options" menu (accessible via the F8 key on the keyboard), note that this is no longer enabled by default since Windows 8.
To reactivate it, refer to our tutorial : Windows 8 / 8.1 / 10 / 11 - Reactivate the F8 menu.
To begin, open the Registry Editor by running the "regedit.exe" program.
Click "Yes" when the User Account Control (UAC) window appears.
Go to the "HKEY_LOCAL_MACHINE" key.
Then, in the subkey : SYSTEM\CurrentControlSet\Control\Session Manager\Configuration Manager.
Then, in the right part, right click "New -> DWORD (32-bit) Value".
Name this DWORD value "BackupCount".
Then, double click on it and enter the number "1" as the value and click OK.
In the left part, right-click on the "Configuration Manager" folder and click on : New -> Key.
Name this new key : LastKnownGood.
In this folder, create a new 32-bit DWORD value.
Name this DWORD value "Enabled".
Double click on this new DWORD value, indicate the number "1" and click on OK.
Now, in the "Advanced Boot Options" menu accessible via the F8 key when starting your computer, you will again have access to the "Last Known Good Configuration (advanced)" option.
Important : this option must be re-enabled before Windows 10 or 11 crashes so that Windows 10 or 11 can regularly save the last known good configuration.
It's therefore useless to reactivate it by modifying the registry "offline" using a Live CD in the event that Windows 10 or 11 is already planted.
On the day when Windows 10 or 11 no longer starts or works properly, this "Last Known Good Configuration (advanced)" option may save your life in seconds.
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