A disk error occurred when DOS was loading from the hard disk. DOS does not start.
Restart the computer.
If the error occurs after several tries, clean boot the system with a system boot diskette. If the hard disk does not respond there may be a problem with the hard disk.
If the hard disk does respond, type SYS.COM at the A: prompt.
Increase to the number of FILES to 15 or 20 in the CONFIG.SYS file.
Try another copy of the program. If this copy works, copy the functioning file to the affected media (e.g., hard drive or floppy diskette).