A virus is a code which can either lie dormant in a computer and be not particualry harmful, but it can can also cause computers to shut down, lose of data, and even make the computer need to be reformatted. To prevent this Virus Protection has been created. There are many different programs for Virus protection or Anti-virus software, some working better than others, but the aim of all the programs is to protect your computer from harmful and useless virus's.