I would definately call them, I am going through the same.
I had a harddrive crash, then I sought, I'd give Vista a try since I had a copy of it from my other system which runs it like a rocket. However this one here didn't like it. anyhow, I managed to activate CS3 twice and on the last one when I removed Vista by doing a format, I forgot that I had to deactivate :-/
So first thing monday I will call, i'll let you know how I go. You still got thirty days to activate!
Henrik