Apparently the virus.Win32.Tenga has corrupted my Library of utilities and small software installation files stored in a separate drive, but has not affected the installed files in \Program Files\. The original size was in the tens of MB; after corruption the size if hundreds of KB. Vipre does not find the virus; neither does Malwarebytes. But occasionally, I get a message that on of the installation exe files cannot be opened due to a virus. So I am looking for a utility tool software that can scan for corrupted .exe files that have greatly reduced sizes.