The second and MUCH more costly route is to buy either retail or generic OEM OS install discs and a license key for any of these Windows versions: Win7, Win8/8.1, Win10. Since the laptop shipped with Win7 you know that the original drivers are available for that OS, but there's only 3 years left of life (read "security updates") left for that OS. If you go to 8/8.1 and then upgrade to Win10 or buy Win10 direct then "perfect" drivers are less certain.