If you have linux you can load the live cd or OS and download the driver to a usb stick or removable media, If you feel inclined to you can also partition you HDD to be spit and save the driver the which ever partition that will be free space after installing Windows. The Linux live cd can save to hard drives that are split. I have had this happen many times and resort to these methods or use another computer to download drivers to removable medias then load up all my drivers from there. Hope this helps.