Virii were mostly spread over floppy (boot block or trojan) back then. While I agree that it's very unlikely that this system will get infected, don't think that times were better back then :)

http://www.teyko.com/View.aspx?id=346&name=Saddam+Virus

...which was a rather brilliant little thing, but a personal hatred as it messed up many a .s files (.s stood for "source code" or "Seka", I guess).

Obligatory nitpick regarding the plural of "virus": http://linuxmafia.com/~rick/faq/plural-of-virus.html

Richard Karsmakers used "virii" to describe a plural of computer virus in the 16-bit era, largely on the basis that it was shorter. It isn't correct Latin, but it is a VX scene thing, so is absolutely correct in this context.