I have a sony vaio with preinstalled xp home.

I have new XP home OEM with an activation key that was never used.

I did the repair install, and used the key on the back of the Sony.

When I tried to activate online it said the keys did not match.

I got to the screen where they give you the 50 digit number and the MS voice system gives you a 45 digit number to key in.

That worked and its activated.

I never used the key on my new XP cd.

So what happened?
Was the key on the Sony wrong?
Did I activate with some other key that was stored.
I didn't use the new xp key so it could not have used the new keys.. right?