The drive on which Windows is installed is locked

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If you receive an error message Your PC needs to be repaired when you start your Windows 10, Windows 8 or Windows 8.1 computer, this message may help you resolve the problem.

The first thing you want to try is to boot in the advanced boot options and try to update your PC. But if you do, you will most likely receive the following message:

The drive on which Windows is installed is locked. Unlock the player and try again.

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When you try to reset your PC, the following message appears:

Your PC cannot be reset. A required disk partition is missing.

The cause of this error is usually a corrupted MBR or BCD file. To solve this problem, there are a few things you should try.

1] Start the advanced boot options. From the WinRE screen, select Troubleshooting > Advanced Options > Advanced Options > Command Prompt. Start Check Disk with CMD. You can use the command chkdsk /r.

2] If a system file needed for booting is corrupted, running System File Checker may help.

3] You may need to change the active partition with . An active partition is one that detects your BIOS and starts your computer.

It is important to note that an incorrect modification of the active partition can make your computer unbootable. Therefore, do not accidentally mark a partition as active if it does not contain the NTDLR loader for your operating system.

Enter the following commands :

List Disk

Now select the drive – it is typically drive 0 – and define it as active drive. Assuming it is disk 0, the :

 Select hard disk 0

Now list partitions :

List of partitions

Assuming your partition number is 0, the command

 will select partition 0

To make it the active partition, type and press Enter :


4] Repair Master Boot Record. This is one of the effective steps to solving start-up problems and we hope it will help you solve the problem.

Update : comment also, below.

Some other links that may help you one day :

  1. How to convert MBR to GPT disk
  2. Windows 8 does not boot ; Automatic repair, update, PC reset also fails
  3. Operating system not found
  4. Bootmgr missing.

Expert Tip: This repair tool scans the repositories and replaces corrupt or missing files if none of these methods have worked. It works well in most cases where the problem is due to system corruption. This tool will also optimize your system to maximize performance. It can be downloaded by Clicking Here

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