I am not sure what you are saying here.
Are you saying you did an upgrade over the top of another windows version and it didnt recognise your hardware or are you saying it formatted the hard drive and you lost your saved driver files.
Either way, simply go to click here
and register for free. Then you can search for your drivers and download them.
Alternatively, you can tell us what these hardware devices are and we can help you further. What is the make of the hardware and models?