Re: speaker drivers?
Speakers don't have drivers (well...not software drivers, the speaker cone and coil assembly is often called a "driver" but is not related to software in any way). Sound cards have drivers. You'll need to find out what model sound card you have and download the drivers.
If your PC is custom built, use the motherboard CD or sound card CD (depending on if you use onboard sound or a separate sound card) to install the drivers. If you can't find the CD, go to the board or card manufacturer's site and download the drivers. Most onboard chips are Realtek, so you could try Realtek's site too.
If you have a pre-built retail PC (HP, Dell, Gateway, etc), just go to the manufacturer's site, search for your model, and download the sound drivers there.