So the machine is booting straight into recovery mode, asking you to select a Keyboard Layout ? check if the storage mode of the computer change, betweeen AHCI and RAID ON. Recommended is AHCI

• Select Troubleshooting
• Boot the machine in command line
• Inject the Bitlocker security keys to decrypt the machine drives to facilitate debugging

manage-bde -off c:

check the status of the decryption with manage-bde -status c:

Then perform a series of checks with :

chkdsk c: /f

sfc /scannow