If the virus drops by at least 2/3, subjects will be given the option to enter an open-label treatment period. During the open-label period, subjects will receive 600 mg RCV (Racivir®) once daily along with their regular HAART medications. Before entering the open-label period, the study doctor may decide to change the subject's other ARV medications. Participating subjects will be financially responsible for all medications, other than RCV (Racivir®), that the study doctor may prescribe.