Win7 startup repair

Win7 startup repair (Ubuntu deleted into the grub rescue situation)
Cause:
installed win7, and then installed Ubuntu in another partition.
The Ubuntu partition was later removed.
The system window appears after the system starts: grub rescue:_
The correct solution:
1. Insert the optical drive into the win7 installation disk or boot with USB (win7 supports USB direct boot installation):
2. After selecting the language, go to the next step and select the repair below instead of continuing the installation;
3. After searching the installed system, go to the next step;
4. Don't let Windows automatically repair, useless, Enter the command prompt mode;
5. Enter bootrec /fixmbr Enter; bootrec /fixboot Enter;
6. Restart the system to restore Windows7 boot mode.