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Hi Microsoft Support Team,I need urgent assistance with my Samsung Galaxy Book running Windows 11 (version 10.0.26200.8037).

Pedro Nunes 0 Reputation points
2026-03-12T15:49:31.33+00:00

Problem summary: After a normal reboot, my PC stopped working correctly. The C: drive is inaccessible and I cannot open Excel, OneDrive, Bluetooth, or any system tools.

Diagnostics already performed via PowerShell:

  • Get-Volume shows C: with FileSystemType: Unknown, Size: 0B, FreeSpace: 0B
  • Get-Disk shows the physical disk as Healthy, Online, 476.94GB, GPT (Samsung SSD)
  • DriveType is 3 (local disk) but Size and FreeSpace return empty
  • Error code 0x800704b3 when trying to open cmd.exe
  • chkdsk C: /f /r returns "Access denied" even in Recovery Mode
  • repair-volume -DriveLetter C -OfflineScanAndFix returns "Access denied"
  • No admin-level PowerShell session can be opened — all elevated commands are blocked
  • net localgroup administrators confirms admin accounts exist but none can execute privileged commands

What I need: Remote assistance to repair the C: volume file system without losing user data. All personal files are backed up on OneDrive.

Device info:

  • Device: Samsung Galaxy Book
  • OS: Windows 11 version 10.0.26200.8037
  • Disk: Samsung SSD 476.94GB
  • User account: standard (not admin)

Thank you for your help.Problem summary:

After a normal reboot, my PC stopped working correctly. The C: drive is inaccessible and I cannot open Excel, OneDrive, Bluetooth, or any system tools.

Diagnostics already performed via PowerShell:

  • Get-Volume shows C: with FileSystemType: Unknown, Size: 0B, FreeSpace: 0B
  • Get-Disk shows the physical disk as Healthy, Online, 476.94GB, GPT (Samsung SSD)
  • DriveType is 3 (local disk) but Size and FreeSpace return empty
  • Error code 0x800704b3 when trying to open cmd.exe
  • chkdsk C: /f /r returns "Access denied" even in Recovery Mode
  • repair-volume -DriveLetter C -OfflineScanAndFix returns "Access denied"
  • No admin-level PowerShell session can be opened — all elevated commands are blocked
  • net localgroup administrators confirms admin accounts exist but none can execute privileged commands

What I need: Remote assistance to repair the C: volume file system without losing user data. All personal files are backed up on OneDrive.

Device info:

  • Device: Samsung Galaxy Book
  • OS: Windows 11 version 10.0.26200.8037
  • Disk: Samsung SSD 476.94GB
  • User account: standard (not admin)

Thank you for your help.

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  1. VPHAN 25,000 Reputation points Independent Advisor
    2026-03-12T16:25:37.55+00:00

    Hi Pedro Nunes,

    Providing remote assistance requires a functioning operating system and network stack, which is currently impossible since your Windows environment cannot load. The diagnostic output showing a healthy physical disk but an unknown file system with zero bytes indicates that the logical structure of your Windows partition is either severely corrupted or actively locked by device encryption. The error code 0x800704b3, which typically points to an unresolvable path, confirms that Windows cannot locate core executables like cmd.exe because the system volume is completely unreadable in its current state.

    The persistent access denied messages you are encountering in the Windows Recovery Environment are almost certainly caused by BitLocker Drive Encryption rather than permanent file system damage. Modern devices like your Samsung Galaxy Book encrypt the system drive by default to protect your data. When the recovery environment loads, it cannot scan or repair the volume until it is manually unlocked. You will need to log into your Microsoft account on another device to retrieve your BitLocker recovery key. Once you have the forty-eight digit key, you can open the command prompt within the recovery environment and use the manage-bde executable to unlock the drive. The specific command to type is manage-bde -unlock C: -RecoveryPassword followed by your numerical key.

    After successfully unlocking the drive, you can run the chkdsk C: /f /x /r command again to attempt a repair of the file system and bad sectors. If the volume still shows up as unknown after the disk check completes, the corruption is unfortunately beyond a local logical repair. Because your personal files are already safely synchronized to OneDrive, the most reliable path forward is to perform a clean installation using a USB drive formatted with the official Windows 11 Media Creation Tool. You can boot your device from this USB by pressing F10 during startup, which will allow you to delete the corrupted partitions, rebuild the file system natively, and securely restore your data from the cloud.

    Hope this answer brought you some useful information. If it did, please hit “accept answer”. Should you have any questions, feel free to leave a comment.

    VP

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