How to Fix Blue Screen Error 0x0000007B on Windows

What Causes This?

Blue screen error 0x0000007B usually means Windows cannot access the system drive during startup. This often happens after changing SATA/RAID settings in BIOS, installing the wrong storage controller driver, cloning or moving Windows to a new drive, or after file system corruption. In some cases, malware, a failing SSD/HDD, or damaged boot files can also trigger it.

Common Symptoms

• Windows crashes during startup with STOP 0x0000007B
• The PC restarts in a loop before reaching the sign-in screen
• The error appears after replacing a drive, cloning Windows, or changing BIOS settings
• Safe Mode also fails to load
• Startup Repair cannot boot Windows normally

How to Fix It Manually

1. Disconnect new hardware and external drives

   • Shut down the PC completely.
   • Unplug USB drives, external SSDs, memory card readers, and any newly added hardware.
   • Start the PC again and check if Windows loads.

2. Check SATA mode in BIOS/UEFI

   • Restart the PC and enter BIOS/UEFI by pressing Del, F2, F10, or Esc during startup.
   • Find the storage setting, often called SATA Mode, SATA Operation, or Storage Controller Mode.
   • Make sure it matches the mode Windows was installed with, usually AHCI or RAID.
   • If it was recently changed, switch it back, save changes, and restart.

3. Run Startup Repair from Windows Recovery

   • Force Windows Recovery by interrupting startup 3 times, or boot from a Windows installation USB.
   • On the Choose an option screen, go to Troubleshoot > Advanced options > Startup Repair.
   • Select your Windows installation and let the repair complete.
   • Restart and test booting again.

4. Repair disk and system files from Command Prompt

   • In Windows Recovery, open Troubleshoot > Advanced options > Command Prompt.
   • First find your Windows drive letter. Type:

     diskpart
     list volume
     exit

   • Then run these commands, replacing C: if Windows is on another drive:

     chkdsk C: /f /r
     sfc /scannow /offbootdir=C:\ /offwindir=C:\Windows

   • Wait for both scans to finish, then restart.

5. Rebuild boot records

   • Go back to Command Prompt in Windows Recovery.
   • Run:

     bootrec /fixmbr
     bootrec /fixboot
     bootrec /scanos
     bootrec /rebuildbcd

   • If bootrec /fixboot returns Access is denied, continue with the other commands and restart to test.

6. Check the drive for hardware failure

   • In BIOS/UEFI, confirm the system SSD or HDD is detected.
   • If the drive is missing, making clicking noises, or frequently disappears, it may be failing.
   • If possible, connect the drive to another PC and check its health with the manufacturer’s diagnostic tool.
   • Replace the drive if errors are reported.

7. Use System Restore if the error started recently

   • In Windows Recovery, open Troubleshoot > Advanced options > System Restore.
   • Choose a restore point from before the blue screen started.
   • Complete the restore and restart.

Fix It Automatically with Kudu

After you recover from a 0x0000007B crash, Kudu can help clean out temporary files, leftover update data, and other junk that may slow down startup or waste disk space. It gives you an easy way to tidy the system after repairs without digging through Windows settings manually.

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