The Virus will continue to replicate itself to other programs sometimes doing so until it takes so much memory that it destroys programs, files or data that is stored in memory. The Boot sector is a small program that is the first part of the operating system loaded by the computer. The boot sector contains a small program that tells the computer how to load the operating system. By placing the code of a virus into the boot sector a virus can guarantee that it will be executed. Once the virus is executed it can load into the memory and replicate and infect other programs.
Most programs come on a compact disc, which is more difficult, then a floppy disk to alter.
Most of today s viruses are transmitted through email. Email viruses are created as word, excell or another kind of document. The document that is sent to someone via email when the document is opened the virus spreads at an incredible speed and can shut down an email service. Typically email viruses will replicate and send themselves to a specified number of addresses found in the original victims address book. The individuals who are receiving it from the first person who opened it then open the virus and the virus is sent out through their address book.