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The first method, of course, is to format the hard drive. But making a BAT file is old, and people can prevent it. So these are some tricks that i found out.

To Format a C drive:
Copy/paste this into Notepad and save it as an EXE file (not BAT):

If that doesn't work, try this:
To Format a D drive:
To Format an A drive:

Deleting The Boot.ini

You can use the same method as above to create an EXE file that deletes the Boot.ini:

Deleting Boot.ini with a BAT file

Or if you prefer the old BAT command, save this in Notepad as a BAT file(although this deletes other files too):

If you have physical access

Finally, if you have physical access to your victim's computer, you can delete the Boot.ini yourself manually. First, you have to enable viewing of Hidden/Operating System Files.

In Vista:
Open any folder, On the top left, click Organize>Folder &Search Option>Click on the view tab, then choose to show Hidden Files and uncheck the Hide protected operating system files box.

In windows XP:
Open any folder, click on the tools menu, then Folder options, click on the view tab, then choose to show Hidden Files and uncheck the Hide protected operating system files box.

After you have done this, go to my computer, then the main hard drive (most probably C) and look for the file boot.ini - Delete it permanently and you won't be able to boot windows again.