Find out the model of your pc and more then likely you will need another computer that has internet access and go to the manufactuer's website and go to support > drivers > then enter your model number and download it all.
DELL, HP go by Serial Numbers more recently and SONY, APPLE go by model number.
If you know the model/serial number or can't seem to find it let me know what kind of PC it is and I will be more then happy to help you locate it and help you get to where you need to download it.
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