DOS get the most out of their systems. The user interface isn't the greatest, but since you rarely interact with antivirus programs, that isn't really a problem. IBM AntiVirus excels not only at detecting and correcting a wide array of viruses but also at detecting and avoiding false-positive readings.
Regular updates provide new virus signatures for scanning.
The product is able to correct many infections automatically. As with all entries in this category, McAfee includes real-time protection for DOS sessions. Professional allows backup to floppy disk and features intelligent compression algorithms and disaster recovery features. It is relatively easy to use, with good disaster recovery. The user interface isn't great, and configuration options are limited, but the speed and reliability are excellent.