This reverts to the last successful registry and driver configuration.
To start the repair process, you must boot from external media or force the server into its built-in recovery mode. windows server 2012 r2 boot repair
tool. In the command prompt, enter the following commands one by one: bootrec /fixmbr : Writes a new Windows-compatible Master Boot Record to the system partition. bootrec /fixboot : Writes a new boot sector to the system partition. bootrec /rebuildbcd : Scans all disks for installations and allows you to rebuild the Boot Configuration Data (BCD) Phase 3: Repairing the BCD (Boot Configuration Data) rebuildbcd This reverts to the last successful registry and