IF it was your desk top telling you this the simple answer would be get a USB2 PCI card. USB capability is part of the MoBo and there for I would imagine there is no Download to sort it Now laptop- take a look in MicroMart [comes out weekly on Thursdays] All sorts of computing goodies and spares therein. I would imaigine a pcima card or a usb2 to usb1 dongle could be a possibility.
As jack has said, high speed USB 2 is a hardware device that your laptop either has or has not. It is not a software update. Look in Device Manager and if the word 'Enhanced' doesn't appear anywhere under USB then you only have USB 1.1. If you plug a USB 2.0 device into a USB 1.1 port you will get a message saying something to the effect of 'a highspeed device is plugged into a low speed port' although the device should still work, albeit at the slower 1.1 speed. If you only have USB 1.1 you can get a PCMCIA to USB 2.0 adapter that will provide USB 2.0 to your laptop. click here for one example.