1.   Millions of unsuspecting computer users are vulnerable to software viruses, and most of them have no idea how to fight an infection.

2.   When an unsuspecting computer user opened the document, a program hidden within the file spread the virus through electronic mail systems.

3.   Other con artists trick unsuspecting computer users into providing card numbers.

4.   Another method is for con artists to trick unsuspecting computer users into providing card numbers.