i just did the same about 2 months ago, although it was in win98, winxp should be the same. First make sure all your important files are backed up (like on a cdr). Did your new drive come with install software? mine was a maxtor, which came with step by step. You will need to set your old drive as the slave on the cable and with its jumper settings and your new drive as the master. If you don't have the right jumper settings for your old drive try getting them from the manufacturer's web site. I got mine off of western digitals page, they had great illustrations which made it simple. Hope this helps....