Can't activate Win XP after Parallels install?

Hello folks.

I installed Parallels. During the install it asked me for my Win activation code. I entered it.

Then after Win completed installing, Win asked me for the activation code. I entered it. Win tells me that I have already used that code and won't let me activate.

What happened?

And yes, this is full retail version of XP Home.

Thanks!

 

Anyone have a clue?

 

Can't you activate XP over the phone, too? Try doing that.