The simplest way to find out what device has the problem is to go into 'Device Manager' - 'Win Key+X - Control panel - Device manager (in the top left hand corner)' - and have a look. You are looking for any entries that have a yellow exclamation mark or a red cross against them. If there are any such entries expand the heading to find out exactly which device needs drivers. If it is a system type device than you can right click on the entry and go to the 'Drivers' tab and just select install drivers. This is for things like mice, keyboards and CD drives which nearly all use generic Windows drivers.
If it turns out to be a proprietary device - audio, ethernet, video, etc. - then you can get the item model from the entry and go to the manufacturer's site to download the drivers.