Final answer:
Check Disk (Chkdsk) is the correct tool scheduled to fix hard drive errors by scanning for and repairing file system issues or bad sectors.
Step-by-step explanation:
The tool that should be regularly scheduled to fix hard drive errors is Check Disk (Chkdsk). This utility scans the hard drive for errors and bad sectors, repairing any issues related to file systems or metadata. It is intended to ensure the integrity of the file system on the disk.
Defragmentation is used to rearrange the files on a disk to increase efficiency and speed, but it doesn't fix errors. System Restore can help to revert system files and settings to an earlier point in time but is not used for fixing hard drive errors. Antivirus Scan is used to detect and remove malware, not to repair physical or file system errors.