You need to borrow or buy one somewhere. The laptop doesn't use a cable in the same way a desktop does, you plug the hard drive into the sata interface on a laptop, and plug the interface into the hard drive with a desktop. If that makes sense. You can pick one up anywhere. Here's an example.
http://www.newegg.com/Product/Produc...82E16812123186 They're all pretty much the same, but some are sata I and some sataII, that's different data transfer speeds, get sataII it'll work for either. Then there's different colours, lengths, and angles to the head (straight or 90 degree), doesn't matter what you get, as long as it plugs into the hard drive on one end and the motherboard on the other.
And once you get the drive recognized, here's how to take ownership, if required.
http://support.microsoft.com/kb/308421