Rebuild MBR with Aomei Partition
Before you do
Download the disk partition software first.
Supposing your computer can not boot, on this condition, you need to create WinPE bootable CD with AOMEI Partition Assistant on another computer. After that, you can start your computer and rebuild its MBR by using this Bootable CD to first boot into the computer which can not boot.
There is another way to rebuild corrupted MBR when your computer can not boot: Unplug your disk that need to be fixed and plug this disk to another machine or your friend's computer, and run AOMEI Partition Assistant on your friend's computer, and Rebuild MBR for the disk.
To Rebuild MBR
Rebuild corrupted MBR only can solve problems such as MBR code has been damaged. It's beyond Rebuild MBR's ability to deal with OS unbootable problem which is caused by bootable file or system file missing.
Rebuild MBR would not lead to any kind of data loss. However, improperly Rebuild corrupted MBR might cause your computer unbootable. So, you'd better learn more relevant knowledge before you execute Rebuild MBR operation or please make a backup for this disk in advance.
Free version of Aomei Partition Assistant also has "Rebuild MBR" feature.