How to Recover Accidentally Deleted Operating System in Windows 11/10

Updated By

Tracy King 

Written By

Linda 

Last Updated on April 22, 2024

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Accidentally Deleted Operating System in Windows 11/10

In ordinary use, it's not easy to delete the Windows operating system, and if you're using Windows, you can't delete it. However, it is possible for an operating system to be deleted from a computer. There are a few circumstances where you might accidentally delete your operating system.

• You accidentally deleted the operating system in Windows Preinstallation Environment.
• You started your computer from a bootable media and accidentally deleted the operating system.
• Your computer has a dual-boot configuration, and you deleted one of the operating systems when starting from the other.
• You deleted the operating system after cloning the system, reinstalling the OS, performing a system recovery, or making a mistake.

When an operating system is deleted, your computer becomes unable to boot normally, and the files stored on the computer's hard drive become inaccessible. To remedy this annoying issue, you need to restore the deleted operating system to enable your computer to start up properly again.

How to Restore the Operating System if Accidentally Deleted in Windows 11/10

Usually, deleting the operating system means deleting the entire system partition. Therefore, you need a partition tool - tools Partition Master to recover the deleted system partition. With this tool, you can recover the deleted operating system in Windows 11/10 and boot your PC normally in three steps:

Use the Partition Master tool to create bootable media. Boot your computer from the bootable media and recover the system partition. After that, you can add a boot option in BIOS/UEFI to restart your computer from the hard drive and boot into Windows again. To restore a deleted operating system:

< strong > Step 1: To create a bootable Partition Master tool disk, you'll need a storage medium like a USB drive, a flash drive, or a CD/DVD. Connect the drive properly to your computer.

Step 2: Launch Partition Master and find the "Boot Media Builder" feature on the left side. Click on it.

Step 3: If you have a drive available, you can choose between USB or CD/DVD. However, if you don't have a blank media device, you can also save the ISO file to your local drive and burn it to media later. After making your choice, click on "Create" to start the process.

Review the warning, and then click Yes.

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Step 4: When it's done, you'll see a pop-up asking if you want to restart your computer from the bootable USB disk.

• Restart now: This means that you want to restart your computer immediately and boot from the install media to manage disk partitions without an operating system in place.
• Finish: This means that you do not want to restart your computer, but instead want to use the bootable USB device on a different computer.

Note: To use the bootable disk on a new computer, you need to restart the target computer and press F2/F8/DEL to enter the BIOS and set the USB bootable disk as the first boot device.

Wait patiently, and your computer will automatically boot from the USB boot media and into the WinPE tool desktop.

Note: If you accidentally deleted the Windows 11/10 ISO file to the Recycle Bin, you can also recover the image file. Also read:

How to Recover Deleted Files from Recycling Bin?

Looking for a way to perform recycle bin recovery? Follow the guide to learn how to immediately recover deleted files from recycle bin.

Step 1: Create bootable media using Partition Master tool

You have created a WinPE bootable disk with Partition Master. Connect the WinPE bootable disk to the computer with the corrupted Windows system, and restart the computer to enter BIOS/UEFI to change the boot order. Press “F2” (the BIOS key may vary depending on the computer manufacturer) when the computer starts up. This will allow you to run Partition Master without having Windows, and recover the system partition.

Before you begin, there are a few things you need to sort out.

If in the Partition Master tool, you see the original system partition displayed as Unallocated space or RAW format, you can follow these steps to recover the partition and the Windows OS within. If you see the system partition still exists but cannot boot the computer, it might be due to accidentally deleting some Windows system files. In this case, you can refer to the article on system boot issues (related to another software but with some generally applicable solutions) or use the hard drive recovery software - Tool Data Recovery Wizard to create a bootable media, start the computer from the device, recover deleted Windows system files, and create a boot option in BIOS/UEFI to restore the operating system.

Process 2: Recovering the Operating System in Windows

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Step 2: Be patient and let the software perform a "Quick Scan" and then a "Deep Scan." In the "Status" section, it will mark your deleted partition as "Lost." Select the lost partition and click " Recover. "

You can also double-click the partition you want to search to preview its content, and then click "OK" to confirm.

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Step 3: Wait patiently for the partition recovery to complete, then click "Finish".

Program 3: Add Boot Options

Adding a boot option in BIOS or UEFI mode isn't straightforward, and it can vary depending on your boot mode and computer brand. You can search online for specific guides based on your setup. Alternatively, you can reach out to our support team through the live chat option available below or via the provided phone number for remote assistance. Apart from assisting with creating a boot option, our support team can also help with data recovery and other related issues.

Bottom line

Though not common, accidentally deleting an operating system does happen. To regain access to your files and recover the deleted OS, you'll need a partition recovery tool like Partition Master to create a bootable media, which is 100% secure, virus-free, and plug-in free. Should you encounter difficulties in data recovery or adding boot options, feel free to reach out to our support team for assistance.