You receive the following error message when installing FDE:
The Installer has detected that a version of DriveArmor is already installed. Please uninstall that version first before you continue.
You will not be able to install even when using the forcesoftware switch.
The issue happens because the hard drive on the system is a Self-Encrypting Drive (SED) and disk is in eDrive mode. Since Windows 8, Microsoft has enabled by default the eDrive feature during the installation of the operating system when the disk is an OPAL 2 SED. This prevents the FDE installation on the SED.
Then you need to install Windows 8 again and disable eDrive during the installation.
Use the tool from disk vendor:
We only support the Seagate and Sandisk self-encrypting drives and will install FDE in software mode for other SEDs. Since installation in software mode is also prevented when the disk is in eDrive mode, please refer to the drive vendor to get the specific process to reset the drive to factory settings.
- Boot to the Windows 8/8.1/10 setup DVD.
- Press shift-F10 to load a command prompt.
Type the following then press Enter:
reg add "HKLM\SOFTWARE\Policies\Microsoft\Windows\EnhancedStorageDevices" /v TCGSecurityActivationDisabled /t REG_DWORD /d 1 /f
- Close the command prompt and continue with the operating system install.