prevent new user accounts

While doing some system maintenance I discovered that I had an extra user account. After deleting it I did a search and found that it had most likely been silently created by the copy protection on some game I had installed. I don't mind if a game has copy protection on it, but I don't like that whatever game it was created a user account with notifying me. Is there some setting that I can change to make win7 lock out any attempts to create new user accounts?

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