Full Guide: Windows 7 Boot Repair without Disk

January 16, 2019

When your system fails to boot into Windows 7/8/10, you can boot it from installation CD to repair Windows. But no installation disk available? Relax, AOMEI Partition Assistant can realize Windows 7 boot repair without disk.

“Can I repair Windows 7 Pro without a disk?”

“My laptop came with win7 home premium and I purchased a legit downloadable win 7 pro upgrade about a year or so ago. It worked well until last week. After a sudden power failure, I cannot boot it successfully as normal and stuck in the black screen. Now I need to repair Windows but I don't have an actual disk; so is there any way to Windows 7 boot repair without original Windows disk? Thanks!”

Windows Error Recovery

Typical reasons and symptoms

For Window 7/8/10 boot failure, there are many reasons you need to consider. For instance, BCD (Boot Configuration Data) files are missing or corrupt; System files are damaged, MBR (Master Boot Record) gets damages and other unknown causes.

When Windows fails to boot, you might receive various error messages like “Reboot and Select Proper Boot Device”, “Your PC/Device needs to be repaired”, “No bootable device found”, etc.

How to Repair Windows 7 boot issue without disk?

As for Windows 7/8/10 repair, in most cases, you need to insert a Windows installation DVD/CD and reboot your computer from it. Then you can perform a Startup Repair, run CHKDSK to check disk for error, and even use the Command Prompt to fix BCD or rebuild MBR.

So you might wonder “is it possible to repair Windows without a Windows installation disk?”. Absolutely “Yes”! For such task, AOMEI Partition Assistant Standard can help a lot. It is free but powerful disk manager software for Windows 10/8/7/XP/Vista users. With it, you can create a bootable media first, then boot your computer from it, and repair Windows by checking system disk and rebuilding MBR under WinPE environment.

Before you proceed:

Create a bootable USB drive: Plug a blank USB to a working computer, then download, install and run AOMEI Partition Assistant on that PC. Click the “Wizard” on the top side and choose “Create Bootable Media Wizard”. Then follow its prompts to accomplish the process. (PS: USB will contain pre-installed AOMEI Partition Assistant).

Make Bootable USB

Boot your computer from the created bootable USB drive: Insert the bootable USB to the computer with boot problems. Power it up and constantly press Del (F2 or another specific key) to enter BIOS. Change boot priority to make your computer boot from USB drive. Save the changes and restart your computer into Windows PE environment.

1.  Rebuild MBR

Damaged MBR is one of the most common reason for Windows failing to boot, so here we will first show you how to rebuild MBR via AOMEI Partition Assistant.

Step 1. Once you log in, you will see the loaded AOMEI Partition Assistant. Right click the system disk and select “Rebuild MBR”.

Rebuild MBR

Step 2. Choose an appropriate MBR style for your current operating system and click “OK”.

MBR Type

Step 3. Back to the main interface, click “Apply” and then “Proceed” to execute the pending operation.


2.  Check system drive for errors

To check whether there are some bad sectors on the system partition, you can do as below:

Step 1. In the main console of AOMEI Partition Assistant, right click the system partition (usually C drive) to select “Advanced”> “Check Partition”.

Check C Partition

Step 2. Tick “Check partition and fix errors in this partition by using chkdsk.exe.” and hit “OK”.

Check Partition Method

Step 3. Wait for a few seconds and minutes to complete the partition checking and fixing process.

Check Process

Or you can right click the entire system disk to choose “Surface Test” to make a disk surface test.

Surface Test


Under the help of AOMEI Partition Assistant Standard, you can perform Windows 7 boot repair without Windows installation disk. But in order to avoid Windows 7 boot failure in the future, you can clone windows 7 to new hard drive for a backup and quick recovery. Besides, you can easily convert boot disk between MBR and GPT styles, recover lost/deleted partition, enlarge system drive after you upgrade to AOMEI Partition Assistant Professional.