IMPORTANT: The details below do not apply to systems fitted with Opal disks. Make sure that you check the disks make, model, and encryption method in ePolicy Orchestrator (ePO) before proceeding.

CAUTION: This article contains information about opening or modifying the registry.

• The following information is intended for System Administrators. Registry modifications are irreversible and could cause system failure if done incorrectly.
• Before proceeding, Technical Support strongly recommends that you back up your registry and understand the restore process. For more information, see the Microsoft Windows registry information for advanced users article.
• Do not run a REG file that is not confirmed to be a genuine registry import file.

Edit the registry and make sure that the McAfee Opal driver is not loaded. 

1. Press the Windows key + R, type regedit, and press Enter.
2. Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4d36e967-e325-11ce-bfc1-08002be10318}\UpperFilters
3. Right-click UpperFilters and select Modify.
4. Delete the entry MfeEpeOpal.
5. Click OK.
6. Close the registry editor.
7. Restart the computer.