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On opening Asus T100T laptop, immediately after a Windows update, error message appears: Process1 Initialisation Failed. Then I am asked for a Bitlocker Recovery Key. Absolutely did not install Bitlocker. Managed to find recovery key via Microsoft account - no idea how it got there - we didn't save it.
This key worked, and operation was normal for a few days. Now am getting the same messages, and inserting the Bitlocker key has no effect - the messages just keep looping.

I have looked at the tutorials, and have used Command Prompt to turn on auto unlock
BitLocker Auto-unlock - Turn On or Off in Windows 8

and to
BitLocker Recovery - Unlock a Drive in Windows 8

To no effect - the messages keep on the same cycle. Any ideas?