Windows 10: BitLocker won't turn on; system can't find file (Windows 10 Pro).

I have a hybrid drive with three partitions. I want to encrypt the two non-system partitions. One is working, and one isn't. Pre-encryption, this is the set-up:







The E drive is currently in the process of encrypting, apparently without any problem. But while attempting to encrypt my C drive, when I try to turn on BitLocker, it tells me "The system cannot find the file specified." (I tried it both before and after starting to encrypt E.)







Any help would be greatly appreciated.

:)

 

Disabling BitLocker

What version of Windows 10? Windows 10 Home that comes on almost all computers doesn't have Bitlocker so you won't find it if you have Home. Only Pro and Enterprise have Bitlocker. Check with Remix to see if it is compatible with windows 10. That might
be the problem, not bitlocker.

 

Planning to upgrade and rebuild

Thanks for the comments, but the project is much, much broader.

After doing further research, I think the project has to be chopped up into smaller, more manageable steps. Basically, do an in-place upgrade to Windows 10 Pro first, then make sure that the system works as expected, and only then do a clean upgrade to Windows
10 Pro. The planning steps are (currently) as follows, with open questions identified.

Step 1: Do an in-place upgrade to Windows 10 Pro. This will give me the digital entitlement for Windows 10 Pro, even if I subsequently do a clean install of Windows 10 Pro. Open questions for step 1:

• Do I need to suspend BitLocker on the internal HDD and turn off BitLocker on Storage Spaces/File History prior to the in-place upgrade? Or what BitLocker-related precautions should I take? I like to retain the BitLocker USB key if possible (?)
• Can I keep the Storage Spaces/File History attached for the in-place upgrade or do I need to detach the Storage Spaces/File History for the in-place upgrade?
  
• As a refresher, for Storage Spaces, I use 2 identical external USB HDDs in a mirror configuration, which is used for File History. I call this Storage Spaces/File History

Step 2: Live with the in-place upgrade for at least a week or two, to make sure that the entire Windows 10 Pro system works as expected, including:

• internal HDD with BitLocker drive encryption enabled
• Storage Spaces/File History with BitLocker drive encryption and auto-unlock enabled
• System boots with the same (if possible?) BitLocker USB key

Step 3: Turn off BitLocker system-wide (on the internal HDD and on Storage Spaces/File History) prior to the clean install of Windows 10 Pro. Turning off BitLocker system-wide seems to be the least troublesome option in preparation for the clean install
of Windows Pro, although this may (?) require a new key in the BitLocker USB key after the clean install of Windows 10 Pro.

Step 4: Do a clean install of Windows 10 Pro, no product key should be required as the digital entitlement has been secured in step 1. Open questions for step 4:

• Do a full reformat (not just a quick reformat) of the internal HDD first, as I do not want to rely merely on deleting partitions during the re-install procedure (Do I need a third party app to do a full reformat or will a native Windows utility do
  the job?)
• Create the ISO file and do a clean install of Windows 10 Pro. I believe I need to detach Storage Spaces/File History during the clean install of Windows 10 Pro (?)

Step 5: Re-install all my apps, re-do the configurations/settings.

Step 6: Re-attach Storage Spaces/File History and restore all my files.

Step 7: Turn on BitLocker system-wide with a new key (?) in the BitLocker USB key, including auto-unlock of Storage Spaces/File History.

The clean installed Windows 10 Pro system should now work with BitLocker enabled.

I keep researching the open questions in the above as well as the issues marked with question marks. Any help appreciated