Viruses of the Mind was created in 1991.

Three that come to mind are adenovirus, influenza, and RSV.

No, I used to use it before I got Internet Download Manager (awesome program, if you don't mind paying for a program then get it) I never had any problems with viruses from You Tube Converter.

yes, you can. This is why it is urged to research the games publisher(if you don't already trust the publisher) before you download/play the game. Many come with an executable file(.exe) and may contain viruses. [bear in mind, not all, there are PLENTY of trusted computer games]

Computer viruses, Macro Viruses, and Directory Viruses