Hello John Jones -student number 21267568,
thank you for posting on the Microsoft Community Forums.
It sounds like your computer is asking for a BitLocker recovery key, which is used to unlock a BitLocker-encrypted drive when the normal unlock method is not available. If you do not have the recovery key, you will need to contact your IT department for assistance. They will be able to help you recover your data and resolve any issues with your computer. It is also important to ensure that your computer is protected with up-to-date antivirus software and that you are using strong passwords to prevent future security breaches.
Best regards,
Lei