A. When the anti-virus program was downloaded, installed and a scan done on the whole computer system, no viruses were detected.
B. After a day, the antivirus program was updated and a scan done on all disks and mails. A virus contained in an email attachment in the form of an executable file was detected and deleted.
Generally, a virus is an executable program that replicates itself without the user’s knowledge, and can have varied effects on the computer system depending on the intention of the programmer. Below are some descriptions or viruses that exist in the current technology