It is important that the name of the file at the end of the notepad is the same as the saved filename. So in my example the notepad file was saved as crash.bat.
Copy this file to the computer you want to crash. Here you can either just double click it, or for maximum impact add it to the start menu. The next time the computer reboots it will run this file and crash again. It will keep doing it until the computer is booted into Safe Mode and the file removed.
The more times you type start, the quicker the PC will crash.
The other method of forcing a system crash includes a registry tweak. Only do this if you are confident in the registry, and know how to create and delete keys. If you intend to use this method then I suggest creating a Restore Point beforehand.
Open regedit, by Start, Run, then type regedit.
Locate the following registry key, or create it if it doesn’t exist.
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\i8042prt\Parameters
\CrashOnCtrlScroll
Set the value to 1 after you have found/created it and quit regedit.
Once you reboot the computer, you can test out the new tool by holding down the CTRL key while pressing Scroll Lock twice. This should generate a Blue Screen of Death.

click to enlarge
Once you reboot the computer, you can test out the new tool by holding down the CTRL key while pressing Scroll Lock twice. This should generate a Blue Screen of Death.