For example, how does "Driver Scanner" from uniblue work? I mean, I know it's some kind of scam, but they need to provide some kind of service, after people pay for this app. So how does the full version work? Does it really improve anything, or is it a trick, like running windows update?
closed as off topic by mailq, Bart De Vos, John Gardeniers, Ward, Shane Madden Sep 30 '11 at 1:01
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Every PCI device (and USB device) has a unique 'Vendor ID' and 'device ID', you can make a database with those unique numbers against known working drivers.
Most of the 'free download' websites are just desperate for eye-balls and traffic to come along and click on the page adverts, so they tend to be a huge waste of space.