Norman Virus Control (NVC) is the result of a merger between Norman Data Defense Systems and Novastor, the developers of ThunderBYTE AntiVirus (TBAV). While TBAV will no longer be available for download (all development on the product has ceased in favor of NVC), Norman Virus Control is a solid virus scanner in its own right and even bests TBAV in most areas (with the notable exception of price).
Like TBAV, Norman Virus Control is an excellent scanner for catching and removing any viruses that may be crawling around your hard drive. NVC comes in Windows 3.x, Windows 95/98, and Windows NT versions and sports an attractive graphical interface. The scanner unobtrusively works in the background with its real-time monitoring capabilities, but it is slightly slower than VirusScan and Norton AntiVirus.