The thing which i make out from your post is
1. You had won Roboform 7
2. You activated it.
3. Formated your computer.
4. Tried reactivating and it failed.
Hope my assumptions are correct.
Anyway why you need to reactivate it?? If it is Roboform Anywhere, you don't need to reactivate just install it and then login through your account details.
More over if you have any such problems talk with their support team, they are the ones who can guide you.
Ohh man now i am really confused with what it is?? Can anybody confirm it, whether it is Roboform Desktop or Roboform Anywhere or Roboform2Go??
Does anybody know about the difference?? I highly doubt