Get lo-jack type software. Some computer manufacturers have a built in lo-jack chip. You need to buy the software to enable it. If someone steals the laptop you can login to lo-jack and enable the tracker. As soon as the pc gets a wireless connection it will send it's IP address, the cops can trace that easily. The one for my daughters mac will take a picture and include it also.
Or, you can by a cable lock, and lock it to your bike frame.