Adding some info,
The procedure for adding the disk is easy but beware of drive letter.
Check the 'jumpers' setting on all your ide devices and keep the original drive in the correct place, or you may end up with problem booting windows because of drive 'letters' changed. Your new drive recognized as 'C' and W2000 not finding its files because c

windows is now d

windows for ie....
Nothing too difficult to correct, but if you don't understand this, I would suggest, you buy the new HD and ask a computer more savy friend to make it for you. It should take him/her less than ten minutes.
my 2 cents