If you see “BitLocker waiting for activation”, this is a situation needing careful action: the machine is in an unstable state, and is likely to bluescreen and/or misbehave in other ways unless handled well.

What has happened, is Microsoft’s BitLocker, embedded into Windows, has done at least some encryption of the hard drive, but has lost whatever tool it was that controlled the encryption, so it is not “activated” even though the encryption is in place at least to some extent. One of the tools known to do this, is McAfee Security, it is not unlikely that there are many others.

If you see this situation, don’t try to install or remove anything yet, don’t try diagnostics, just run this from administrative CMD:

manage-bde C: -off

Then, in Control Panel, in the Small Icons, you’ll notice BitLocker Drive Encryption. Please be aware that status reporting in this Control Panel area is not reliably informative. To know what is happening, run this:

manage-bde -status

Discovered by the excellent Yvonne Wynkoop.