Ms. Trudgeon this is better than Mr.Nichelson's website.  I deserve the A not him!!!

1) A computer virus is a small program that changes the computers actions

2) It must execute itself and It must replicate itself

3) File infector Virus, Boot Sector Virus, Master Boot Record Virus, Mult- Partite Virus, and Macro Virus

4) Trojan Horses are files that claim to be something good but are very bad.

5) Worms are programs that replicate themselves from computer to computer without the use of a host

6) Hardware problems ( no virus can cause computer damage), Computer beeps with no screen display, 2 anti virus programs detect each others memory of a virus, Can't open a specific document, Microsoft word warns you that a document contains a macro.