Alright, I will be showing you a code that you can copy and paste into notepad to be a fake virus.
NOTE: Please do not change the code or anything. I am not responsible for anything if that happens!!
I will explain every part of this code to ensure your computer's safety!!:)

Step 1: Notepad

What you need for this instructable is
1. Notepad (or basic text application)
2. Hands (You don't even need two!!)

Step 2: The Actual Code

This code is to be copy and paster into the notepad program.
Please do not alter it!!

@ECHO OFF
title TROJAN!!
ECHO/VIRUS DETECTED!!!
:a
ECHO/CLEAN VIRUS?
choice
IF ERRORLEVEL 2 goto a
IF NOT ERRORLEVEL 1 ECHO/ CLEANING!!
ECHO/ONE MOMENT....
PING 1.1.1.1 -n 1 -w 6000 >NUL
ECHO/Trojan quarantined
ECHO/Deleting
PING 1.1.1.1 -n 1 -w 600 >NUL
ECHO/Taking over the computer!!
PING 1.1.1.1 -n 1 -w 600 >NUL
ECHO/Starting to erase data banks!!
PING 1.1.1.1 -n 1 -w 600 >NUL
ECHO/Shutting down computer!!
shutdown -s -t 60

Now, this is a mouthful. I will explain it in teh next step.

Step 3: Explanation

All of the ECHO's are just instructing the computer to say something.
The choice is telling the computer to give you a y or n choice.
The ping is a time delay
the shutdown at the end tells the computer to shut down.

To avert the shutdown go to commandprompt and type shutdown -a