Vista - New motherboard/processor

What should I do before I install a new motherboard and processor to an existing Windows Vista Business x64 OS?

I know I should probably uninstall all the drivers, but where do I find these?

I did this not too long ago. All you need to do is get rid of the drivers that correspond with hardware that you wont have anymore. For example, a new motherboard usually means a new onboard sound, so uninstall your sound drivers. They can probably be located in the Control Panel -> Programs window. If not there, go into the Hardware Manager and uninstall/disable whatever you need to. Anything thats motherboard specific should go, although there isnt all that much. There is no software that corresponds to processors. Once all that is done, you can swap the hardware and install the new drivers that came with the new motherboard.

Hope that helped

Since my chipset is NVIDIA Nforce SE 550 and I have nothing else NVIDIA in my system should I just uninstall all of that?

I found these three things in device manager:

NVIDIA nForce 590/570/550 Serial ATA Controller
NVIDIA nForce Networking Controller
NVIDIA nForce PCI System Management

So you are not going to reformat and re-install vista - using a new motherboard on a O/S setup for another m/b is asking for problems.

I'd reformat - you will lose your activation and you will have to give Microsoft a call to reactivate it again. No biggie.

Do as the previous post.
Because you are using a new motherboard and cpu vista will see it as a new machine anyway, even if you just change the drivers you will still have to re-activate.
If you are using an OEM version of vista you may have to buy a new licence.