I think there is a problem using a big HD in an old computer, something about the bios... the maximum capacity it can detect is 33 gigabytes or something? I don't know, try to find a bios update if you can, there might be a CD that comes with the new harddrive that contains tools to fix the problem, I remember doing that on my Celeron 433.
If you ever want to hook up a remote control to the pc, look for a remote control by Creative Labs on ebay, it comes with a program that works with Winamp 2.x, if that doesn't work, you could use another program called Girder to make any program work with the remote.