Solve the grub error when Win7 boot solution

Many times we may accidentally delete the system files or other misoperations without knowing, which will lead to the failure to enter the system smoothly, resulting in grub. Grub may be strange to some people because they haven't touched it, so many people may be overwhelmed when this happens.
I have encountered a similar situation around me. My classmate's machine can't enter the system after booting for unknown reasons, but stay on the grub page. For those who are not familiar with grub, it may be forced to restart multiple times to see if they can go in, or simply force a shutdown. This is of course not good, in fact, the restart and shutdown under grub can be soft, such as the reboot command is to restart, halt is the shutdown command. If you don't understand, just type help and then press Enter. A lot of help information will be output.
How do you get into the system normally? As long as three lines of commands can be entered from grub into the system:
find --set-root /bootmgr (Enter) chainloader /bootmgr (Enter) boot (Enter)
However, this has not been completely resolved, if If you only come here, you will have to knock the above three lines of code every time you turn it on. It is a bit of a hassle.
My solution is to rewrite the MBR to the hard drive boot sector. This is the cure method.
Win7 under EasyBCD boot hard disk installation Ubuntu mentioned a tool EasyBCD, this tool is particularly easy to use in win7. Here, the task of rewriting the MBR is given to it. As shown in the figure, after the selection, the Write MBR (execution action) is completed.