In that case, it is spyware. Even free antivirus offer you a cleanup. Spyware Doctor, based on what I remember, is legit, but sounds pretty suspicious. Avast and NOD32 are your best bets. One because it's fully featured, and the other because it's Russian.
Rockyusa
That's because they ARE spyware.
Chdonga
Which is why I only use AVG and Norton.