Smadav

Almost all other antivirus programs cannot be installed alongside another antivirus program, because the antivirus is designed for primary protection on your PC.

This is not the case for Smadav; Smadav is an antivirus designed as an additional (second layer) protection, so it is compatible and can be installed and run alongside other antivirus programs on your PC. Smadav uses its own techniques (behavioral, heuristic, and whitelisting) to detect and clean viruses, enhancing security on your PC.
USB flash drives are one of the most commonly used mediums for virus spread. Smadav uses its own technology to prevent virus spread and infection via USB flash drives. Smadav can detect many new, unknown viruses on USB drives, even if they are not in its virus database. Smadav can help you not only protect your USB flash drive but also clean it of viruses and restore hidden/infected files.