If your computer has ever had a virus, you might have encountered a rootkit—a Trojan that keeps itself, other files, registry keys, and network connections hidden from detection. It gives the attacker “root” access to the computer, which means it runs at the lowest level of the machine. Rootkits are often damaging and have gained notoriety as a form of malware—software designed to destroy data, steal information, or aggravate the user. When was the first virus for personal computers discovered? Discuss