Installing XP correctly is not the easiest task imaginable.
But there is no need to wipe the disk before you start. The XP installer will let you format the partition you want to install it on, and that's exactly what you need. But I don't understand why you just don't start using it as it is. That saves you a lot of work.
My parents just bought a new computer and they are letting me have their old one. I've been searching everywhere to find a way to wipe it. It's a cooler master 330 and is running xp. I just downloaded xp os to a computer and will be putting it on a disk.