VV2 is being sold through bigfishgames.com so I went there to look for an answer for you.

The FAQ over there has the answer to your question, and you will be pleased.

For some generous reason, the answer to the question:
"How do I activate my PC game on another computer?" is
"You can install and activate your game 5 times."

Perhaps bigfishgames created this policy so that people could re-install their games when they upgrade to a newer computer (or have a computer crash) without bothering bigfishgames customer support.

Good luck!

BigFishGame FAQ on re-activating your game on another PC