You would need to give at least the following details, for anybody to be able to help:-
What is the hardware (manufacturer, hardware model number, type of hardware)
What operating system your computer is using (Windows XP, VISTA, Linux etc.)
I need the driver for an SiS 661FX onboard video card, to run in Windows XP with Service Pack 2 installed.
SiS = hardware chipset manufacturer
661FX = model of the actual hardware (100% essential that this is the exact model number)
Onboard = some types of hardware are built-in to a PC (onboard), and others are separate parts.
Video Card = the type of hardware, usually video, sound, USB, printer etc.
Windows XP = the operating system the driver is matched to.
Service Pack 2 = the main system update last installed (essential on most operating systems)
If you have just reinstalled an operating system, and most likely just need 'all' of the drivers for your computer, then it's much easier to let somebody here know what computer you have - this will either be a model number on the case itself, or inside its case, there will be a model number written on the mainboard inside.
The location can vary but usually looks a bit like this example: