Download CPU-z here
Use that to figure out what make and model all of your components are. After you've figured that out, Google it and see if you can find the drivers.
The drivers you'll be looking for depend on how many on-board components you use on the motherboard. If you have on-board sound, video, and ethernet, then you'll need a Chipset driver, a Sound driver, a Video driver, and an Ethernet driver.
Now, to re-format...
I'm pretty sure you need a bootdisk to re-format W2K. You can get one from www.bootdisk.com
. You'll have to put it on a floppy or a CD/DVD and boot with it.
After you've booted with it, you'll probably have a screen where you can type commands. Type:
And that should take you to a screen with like four options, I think you take the bottom one. Basically just navigate through to where you can delete partitions and then make new ones. Delete whichever partitions you don't want anymore, and make new ones.
After you've done that, type:
And it will ask if you want to format your C: partition, you say 'yes'. Repeat that and change the drive letter for all the partitions you want to reformat.
After you have reformatted, you can install your W2K via your install CD, just boot up with it.
Well, I hope I didn't make you more confused than you were. :P
P.S. If I'm wrong about the bootdisk thing, sorry, I've never used W2K before.