Fat Virus this virus will only infect a computer running a file allocation table (FAT) file system. Some examples include: Stator, Asimov.1539, and Terrax.1069 They can lay in wait or take action immediately. Companion Virus once the system is infected they accompany the files that already exist. Once run, the virus does its damage according to the program in the executable file. This virus is activated by running an executable file like. File Infectors The majority of viruses are file infectors. This enables them to replicate and very hard for virus scanners to track down. Polymorphic Virus Viruses that encode or encrypt themselves so that each new version is different. Examples of macro viruses: Relax, Melissa.A, Bablas, O97M/Y2K. This may arrive on your computer by email attachment. When the file is opened the macro virus runs automatically. Macro Virus A virus written in a macro language that infects the files that were created with it. Examples of boot viruses include: Polyboot.B, AntiEXE. To avoid a boot virus, don't boot your computer with an unknown floppy disk in your floppy drive and make sure it is write protected. The boot sector gives the computer information on how to boot, if it is not functioning the computer won't boot. Boot Virus A virus that affects the boot sector of the hard drive or a floppy drive. Examples of this virus include: Way, Trj.Reboot, Trivial.88.D. To get rid of the virus, the file has to be deleted. Overwrite Virus A virus that deletes of overwrites part or all of the information in a file, making them partially or totally worthless. When executed it will infect files in the directory that it is in, plus any directed to, in the batch file AUTOEXEC.BAT file PATH. Direct Action Virus A batch file that resides in the root directory of the hard disk. Examples: Randex, CMJ, Meve, and MrKlunky. It can corrupt files and programs such as copy, open, close, rename and more. It can take over or interupt any operation executed by the computer system. Resident Virus A virus that takes up permanent residence in the RAM memory. What is a computer virus? A computer program that can infect a computer and replicate and spread without the users knowledge. 
Any other type of malicious & unwanted software.A software program designed to cause harm to a computer without the knowledge of the user. What is malware? Mal icious soft ware.
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