Nearly drove myself nuts trying to find drivers for a PCI serial card a few months ago.
That said if the laptop is anything from the last decade there will be drivers on the manufacturer's website.
Ball ache isn't it mate, a while back a laptop lan port stopped working so brought a usb - lan dongle came with a driver disk etc.
Had to upgrade vista to 7 prof to get it to talk to the exchange server in process back all drivers up. Since booting into 7 everything works fine bar the driver for the dongle. The driver i'd backed up was for Vista and has compatability issues with 7, even when you think you've covered all bases they can still stich you up lol, hate them !