[shakthamac]

In my experience, you can use the same copy of XP across multiple computers. Simply, I upgraded from my old tower to a new one and put my old copy of XP on it.
No probs. MS has a lot of rules but they are really meant for resellers and not private home individuals.

I've also activated my copy of XP about a dozen times doing formats and the like over the years, and never had to call MS about it.

You're fine