Answer:
The Creeper System, 1971 - This was the first computer virus, and it was known to be an experimental self-duplicating virus that would fill the hard drive of a computer until it could no longer operate. It was created by BBN technologies in the US.
Brain, 1986 - The first computer virus for MS-DOS, it would overwrite the boot sector of the floppy disk and prevent it from booting. It was written by 2 brothers from Pakistan and was originally designed as a copy protection.
The Morris, 1988 - The first computer virus to spread extensively in the Internet, it was created by Robert Morris, a Cornell University graduate student who wanted to determine the size of the internet.
Michelangelo, 1991 - This virus was first discovered in Australia. It would be dormant until 6th of March every year, and then overwrite the first 100 sectors of the storage devices with zeroes, preventing the computer from booting.
CIH, 1998 - It infected around 60 million computers by overwriting important system files. It was developed by a Taiwanese student.
Melissa, 1999 - This was the first spread of the World Marco Virus. It was distributed via email to the first 50 people of the in the Outlook address book. It did not harm the computer, it just provided a link to erotic websites which required membership. email servers eventually crashed due to the traffic.
"iloveyou", 2000 - Originating from the Philippines, it also came via email to send itself to all of the recipient's contacts. It overwrote image, office, and audio files.
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