What's the exact model of your computer?
Once you have drivers, if you cannot download them, use a different computer to download the driver installers to a USB pen drive or DVD disc. If there aren't drivers for USB or DVD either, make the USB or DVD bootable, copy the driver files onto the USB or DVD, boot into the USB pen drive or DVD disc, and copy the driver installers into the Windows 7 HDD, then boot Windows 7 and run the drivers.
I can provide the steps for that, but to avoid the need for lots of placeholders and confusion, I should know the model of your computer first.