Ok I have a couple questions about computer viruses: 1. How does a computer virus enter the computers memory? Now to my understanding it is download to the RAM's temperary internet files memory cache from the internet and then transfered to the hard drive where it grows into full effect before altering the computer. Also you can get virurs from emails. 2. Why would someone download a virus program? Just because the virus is disguised as something else such as spyware. The user does not think it is a virus untill they download it.