If you're running Windows XP (or Windows Vista) and using Microsoft hardware (i.e.: keyboard, mouse, fingerprint reader, etc.) you can download the latest drivers for it from this page. These drivers will allow you to take full advantage of all the features built in to these devices.
Note: The final version of the Windows Vista drivers are supposed to be available in December. If you want to use beta versions of the keyboard and mouse drivers they're available now.