Hi Johan 20,
you can try the following steps to resolve this issue:
- Boot the computer from the Windows installation media.
- Select the "Repair Your Computer" option.
- Select "Advanced Options".
- Select Command Prompt.
- At the command prompt, type "manage-bde -unlock C: -RecoveryPassword<BitLocker recovery key>" (<BitLocker recovery key> replace with your recovery key).
- Enter "exit" to close the command prompt.
- Restart your computer and try to reinstall Windows.
Hope it helps.
Regards,
Lei