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  • Check if you are using UEFI or BIOS.
    1. Open the System Information app by doing either of the following:
      • Open the Run window, type "msinfo32" and then click OK.
      • Search for "System Information" using Windows Search.
    2. Verify the BIOS Mode. If "Legacy" is indicated, your system is using BIOS.
  • Check if the System drive is NVMe drive compatible. Refer to this KB article:

    Self-encrypting drive compatibility list for Endpoint Encryption

  • SATA mode is RAID.

  1. In BIOS setting, switch the SATA mode from RAID to AHCI.
  2. Boot into preboot.
  3. Login to recovery console.
  4. Decrypt the disk, if it is not decrypted.
  5. Restore preboot partition.
    1. Boot the computer to the Windows CD.
    2. Run the following commands:
      bootrec /fixboot
      bootrec /fixmbr
    3. Reboot the computer. The computer should now be able to boot to the Windows login screen and authenticate successfully.
  6. Switch the SATA mode from AHCI back to RAID (Otherwise Windows may not boot).
  7. Uninstall Full Disk Encryption (FDE) by executing the following command:
    MsiExec.exe /X{17BACE08-76BD-4FF5-9A06-5F2FA9EBDDEA}.

If an error saying that FDE is incompatible with the hardware, FDE must be uninstalled. Following the steps below:

  1. Navigate to C:\Program Files\Trend Micro\Full Disk Encryption\.
  2. Run the TMFDEUninstall.exe file.
 
You may need to login RecoveryConsole.exe using a group administrator to uninstall.
 

 
Backup important files before switching the SATA mode. Switching the SATA mode has a risk of making the OS unbootable.
 

You may need to follow the steps provided in the links below to switch from RAID mode to AHCI mode:

The alternative solution is to reinstall the OS with AHCI mode.

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