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8. Computer restarts for no reason
9. Hijacked accounts and sending messages
10. Lockdown warnings
11. Anti-virus software won't work
12. Corruption of programs
13. Corruption of operating system

Viruses do not only attack computers. They also attack phones, phablets,
tablets and iPads.

Types of Viruses

Retro: Retro is a virus designed to attack anti-virus software designed

to delete them. It can circumvent or disable Antivirus software.
Boot Sector Viruses: Boot sector viruses are viruses that infect the
boot sector and make the computer or media unbootable. Once the Boot
sector becomes infected, it will infect any other media such as floppy
disks drive, zip drive, etc. it comes into contact with. Boot sector is the
part of the hard drive that actually starts the operating system.
BIOS Viruses: BIOS stands for Basic Input /Output System. It is an

area of the memory that controls everything including input and output
devices. It controls devices such as keyboard, mouse, CD ROMs, hard
drives, video cards, etc.
File Viruses: They're the most common type of viruses. They infect
existing files (sometimes replacing them), causing the virus to load into
memory whenever you execute an infected file.

Worms: A worm is a special type of virus that can replicate itself and
use memory but cannot attach itself to other programs. While regular
viruses spread on the local device, worms spread quickly through
existing networks.
Trojan Horses (Trojans): Trojans are viruses pretending to be normal
application software while performing their destructive behaviors
behind the scenes. E.g. is a game that deletes files while the game is

played.

Other viruses are resident viruses, overwrite viruses, direct action viruses, etc.

How Computers get infected by Viruses