Final answer:
The bootrec command is used by a technical support representative to repair boot-related issues on a Windows system, such as a corrupted MBR or boot sector.
Step-by-step explanation:
A technical support representative would need to use the bootrec command to repair the Master Boot Record (MBR), Boot Sector, Boot Configuration (BCD), or add missing Windows installations to the boot configuration data. If a user is experiencing issues starting Windows, such as boot errors or a damaged MBR, the bootrec command helps troubleshoot and resolve these problems. Running this command is especially useful after hardware failures, malware infections, or system corruption that affects the boot process.