[WorksForMe] VirtualBox won't let me encrypt my virtual hard drive.

[All Screws Loose]

When I go to the Encryption tab and check "Enable encryption" is says "Invalid settings detected, even after I select the encryption method and enter two identical passwords. Some information that may be relevant: The disk image format is the default (VDI), the type is Windows 3.1, the disk capacity is configured to be 4 GB instead of the default 1 GB, and there is already an operating system installed (I don't know if you're allowed to encrypt a non-empty disk, but I don't see why you wouldn't be). The VM was powered down when I attempted encryption, so I know that's not the problem. I've already searched the web for how to properly encrypt a disk in VirtualBox, and the tutorials I found didn't tell me anything I didn't already know.

[socratis]

Hover over the triangle with the warning, read the message as to which settings are invalid. It may not be your encryption settings at all...

[All Screws Loose]

I did that. It says I need to install the VirtualBox Extension Pack. I did install it, but it looks like VirtualBox can't find it, so I'll have to reinstall it. Thanks for the help. I think my problem is solved now.

[socratis]

As you figured out, the ExtPack is required for the VM encryption. Make sure that the ExtPack matches the version of the main VirtualBox program. Otherwise you're going to run into trouble.

I think my problem is solved now.

Great. Marking as [WorksForMe].