Boot Sector Virus This type of virus attaches itself to the boot sector of a floppy disk and then copies itself to the boot sector of your hard drive. Once the virus is on your hard drive, it will continue to infect any floppy disks that are inserted into your floppy drive. You can only get a boot sector virus from an infected floppy disk that your computer attempts to boot from. You can not get a boot sector virus from using programs or files that are on an infected floppy disk. Program Virus This type of virus attaches itself to executable files, usually .EXE or .COM files. Once an infected program file is executed, the virus becomes memory resident and then infects all other program files that are executed.
Macro VirusThis is a fairly new type of virus. It is similar to a program virus but actually infects Office application files such as MS Word or MS Excel files. Today's office applications provide the user with the ability to create macros to automate complex or repetitive tasks. The macro virus embeds itself in the Office application file and is activated when the file is opened.
