Computer viruses are called viruses because they share traits with bio viruses.They were first spotted in the1980s.
Here is some tips to keep your computers running fine.
1 Install virus protection software.
2 Avoid programs from unknown sources.
3 Run secure operating systems.
4 Never run macro in documents unless you know what it do.
5 Never double click on an e-mail.
My source is howstuffwork.com
I got my picture from www.merchantcircle.com.