How do I remap my XP keyboard?

The Caps Lock key is the most useless key ever. I want to change it to a second Enter button, for doing design work. I found where you can change keyboard layouts, or add new, but the buttons for 'properties' and 'key settings' are greyed out.How do I remap my XP keyboard?I know a software can remap the keyboard,but I don't know whether it suitable you,but you can have a try.http://www.godsw.com/products/keycustomizer.html.I hope it can help you.