odds are your S.O.L Even if you had tracking software on there anyone can uninstall that or reformat the computer. They only way to really track a computer and know that someone can't remove it, is to get a tracking chip installed.
The laptops my school gives us have one. If we report our laptops stolen, HP activates the chip and whenever the stealer hooks the computer up online (even if he's reformatted) HP will get a signal on where it is and can send athorites to get them.