How do computer viruses work?

Strange as it may sound, the computer virus is something of an Information Age marvel. On one hand, viruses show us how vulnerable we are -- a properly engineered virus can have a devastating effect, disrupting productivity and doing billions of dollars in damages. read more

There are different types viruses and they work differently. Such as Viruses: They are program codes that attach itself to certain programs and when the programs runs they also run and starts damaging. Email virus: They are viruses that send itself as email attachments and even launches without clicking. read more

Some viruses attack the computer’s boot sector, the area on the hard drive that hosts the code for the start-up routine. Such a root code virus causes havoc because it runs itself every time you switch on the computer. read more