By Emily / Last Updated June 5, 2023


“I have a laptop with Windows 7 installed. Today it suddenly froze while I was working. So I turned off it, but when I tried to turn it on, it doesn’t work. How to repair Windows 7 from another computer? Any suggestions would be appreciated in advance!”

The cause of Windows corrupted

If you encounter the problem that the computer cannot boot successfully or receive error messages like Windows Boot Manager Boot Failed. You may be puzzled about why Windows corrupted. The common reasons are as follows:

1. Switching the machine incorrectly, or the voltage is unstable (such as frequently forced shutdown, no UPS, etc.)

2. The hard disk is subject to vibration when reading and writing data, especially strong vibration.

3. Frequently compressing the hard disk.

4. The hard disk is not well cooled, resulting in too high a temperature during operation.

5. The usage environment is too bad.

If your Windows is corrupted, you have to repair MBR for your Windows. Don’t know how to do this operation? Look through the following part to find the answer.

How to repair Windows 11, 10, 8, and 7?

If you want to repair Windows, you can try the following solutions to complete this operation.

Solution 1. Windows built-in tool

Windows provide users with a built-in tool - bootrec.exe.tool. You can use it to repair the MBR if you encounter the problem of Windows boot failure. The specific steps are below:

1. Press F8 to go to the Windows Recovery Menu while booting Windows 10 system.

2. After that, choose “Troubleshoot” > “Advanced options” to get into the “Automatic Repair” menu.

3. Then, click the command prompt to use Bootrec.exe tool. And input the following commands, and run them one by one:

▶bootrec /RebuildBcd

▶bootrec /fixMbr

▶bootrec /fixboot

▶bootsect /nt60 SYS or bootsect /nt60 ALL

Solution 2. Repair Windows on another computer

If you are not familiar with the command prompt, you can turn to third-party software to repair Windows with another computer. Here I highly recommend you AOMEI Partition Assistant Standard - a magical disk partition manager which provides many powerful functions like "Make Bootable Media' and "Rebuild MBR".

You can download this tool to a  working computer, and create a WinPE bootable media to boot up your corrupted PC, then rebuild MBR easily in Windows 11/10/8/7, Windows XP, as well as Windows Vista. The following example will show you the specific steps to repair Windows 10 with another computer:

Download Freeware Win 11/10/8.1/8/7/XP
Secure Download

First of all, connect a blank USB to a working computer and make sure it can be detected.

Step 1. Download, install and run AOMEI Partition Assistant. In the top toolbar, click “Tools”  and select “Make Bootable Media”. Then hit “Next” to continue.

Make Bootable Media

Step 2. In the pop-up window, select “USB Boot Device” and click “Proceed”.

Choose Usb Drive

After that, boot your corrupted Windows 10 computer from the bootable media. AOMEI Partition Assistant will automatically run on the desktop then.

Step 3. Right-click the system disk and select “Rebuild MBR”.

Rebuild System Disk Mbr

Step 4. In the next window, set the type of MBR for the current OS. (Choose a proper MBR type according to your operating system.) Then click “OK”.

Choose Mbr Type

Step 5. After that, click “Apply” on the toolbar to commit the operation.

To sum up

Till now, you can successfully repair Windows with another computer. Besides Create Bootable Media and Rebuild MBR, AOMEI Partition Assistant also provides you many other powerful functions like Resize/Delete/Create Partition, Partition Copy, Disk Copy, Migrate OS to SSD and so on.

If you want to format the file system of USB, AOMEI Partition Assistant can help you too. If you want to enjoy more advanced functions like allocating free space or you can upgrade to AOMEI Partition Assistant Professional.