A DDoS attack
What you are describing is not a type of malware, but a DoS (Denial of Service) attack.
Certain worms that get into your computer shut down your computer when the worm loads. One specific worm is the MSBLAST.exe and W32.Blaster... and also if you search on YouTube you can find people renaming files and creating a fake virus message which shuts down your computer.
Virus' don't help computers, they're given the name virus because they harm your computer, my suggestion, don't get a virus.
A virus
Not to all computers
a virus that is affecting many computers just get protection
Yes, computers are always consistent unless they have a virus or bug.
It is an assault on a network that floods it with so many requests that it is either slowed or completely interrupted. Unlike a virus, which can cause severe damage to databases, a denial of service attack interrupts network service for a long amount of time.
Get the Anti-Virus scan and run it.
Usually. If it shuts your computer down, then boot into safe mode.
The Elk Cloner virus is very old, designed to run on Apple II computers. It cannot infect modern computers.
hardware, or software failure, more than likely not a virus.