Windows 11 startup failure – system driver errors after BitLocker recovery

[Akanksha12]

My HP laptop (Windows 11) was stuck on the BitLocker recovery screen for about a month. I recently entered the correct recovery key from my Microsoft account and it was accepted, but now the laptop won’t boot.

After troubleshooting, it keeps showing a blue error screen with messages like:

File: \Windows\System32\drivers\nllRvrv.sys

Error code: 0xc000007b

Earlier it also failed on:

\Windows\System32\drivers\nllVmm.sys

I have already tried: • Startup Repair

• Rebuilding boot files (bootrec /fixmbr, /rebuildbcd, bcdboot)

• Uninstalling latest quality update

But Windows still won’t start and keeps looping back to recovery.

My laptop contains years of personal and work data, so I want to avoid losing data.

Is there a way to repair Windows this?

Any help would be greatly appreciated.

[Deep_World]

Hi @Akanksha12, 

 
Welcome to the HP Support Community!

Thanks for reaching out!

I Understand your concern and don’t worry let me help you with this.

To better understand the issue, could you please provide a few more details?

• Which exact HP laptop model are you using?
• Do you recall if any new drivers, updates, or software were installed before the BitLocker recovery screen first appeared?
• Are you able to boot into Safe Mode at all, or does it fail before reaching that option?

Here are a few troubleshooting steps you can try:
              Check Safe Mode Access

• Restart the laptop and press F8 or hold Shift + F8 during boot to see if you can enter Safe Mode.
• If successful, you can try uninstalling problematic drivers or updates from there.
  System File Checker & DISM

• Boot into the Windows Recovery Environment (WinRE).
• Open Command Prompt and run:
  sfc /scannow

1. System Restore
• If you had restore points enabled, try rolling back to a point before the BitLocker issue.
2. Data Backup Before Repair

• If none of the above works, I strongly recommend connecting the drive to another computer (via USB enclosure or SATA-to-USB adapter) to back up your important files before attempting deeper repairs or a reinstall.

 If you can confirm whether Safe Mode or System Restore is accessible, that will help us decide the safest next step.

I hope this helps.

I'm glad I could help! 😊 If this resolved your issue, please mark it as "Accepted Solution" and click "Yes" on "Was this reply helpful?" Your feedback not only keeps us going but also helps others find the solution faster! 

Take care and have an amazing day ahead! 

Best regards,

Deep_World.