Computer viruses are programs designed to replicate and spread, sometimes without indicating that they exist. Computer viruses can produce a variety of symptoms on your computer.
Some viruses multiply without causing obvious changes.
More malicious strains can issue random sounds or greet you with unexpected screen messages. In extreme cases, viruses can damage files and hard disks. This virus first infects the boot sector of a diskette. Once in memory, the virus can spread to other disks. The new MBR affects portions of a hard disk that control how your operating system starts when you turn on your computer.