Ok, I cannot think of this for nothing. What is the command that will tell you which (or where) Windows XP your booting from? It's something like %windows...etc. But just can't find it anywhere.
The is a DOS command that you can type in the command prompt that will tell you exactly where and which Windows installation that your pc is booting from and using. i.e. if you, for some reason, had two hard drives and had Windows XP installed on both and you didn't know for sure which one you were booting from, this command would identify and tell you.
I use to know it, but can't remember the command. It's something like %windowsroot% something like that.