A computer virus hoax is quite simply a warning message circulated by someone claiming that a certain file contains a virus, or that your computer will be infected with a virus if you open and read an email with a certain title.
Most are done as jokes. Somebody somewhere thinks it might be a laugh to cook up a convincing sounding hoax and spread it by email to see how far it gets. Think of these kinds of hoaxes as chain letters.
Others are spread by well meaning people who perhaps detect a virus on their computer inside a file or perhaps have a computer fail for some other reason and assume the problem is caused by a virus hidden in the last file they looked at, and email everyone they know to warn them that their copies of this file must be infected too. Recently, the famous SULFNBK hoax probably came about because of a confusion between the legitimate file of that name, and the infected file that the magistr virus uses to spread via email. File these ones under an honest mistake.
Some of the more common hoaxes are about "E-Mail viruses" - viruses which according to the hoax warning can fry your computer if you so much as dare to read the text inside the email message. Of course, we all know this is rubbish because we read the bit on this website that mentions that computer viruses are the same as any other computer program and need to be run before you can do anything... Right people?
Please do not take any notice of these hoax messages as they waste time, both your time and that of everyone you forward the message to. If you are unsure about any message you receive, you can usually decide easily enough if it is a hoax by following these tips:-
If you want to know more about computer virus hoaxes and other similar things then please visit Rob Rosenberger's website at www.vmyths.com - The best source of information I know of for virus hoaxes bar none.