Development of tolerable and effective antiretroviral (ARV) drugs for use in children and adolescents remains a high priority. First-line therapy with non-nucleoside reverse transcriptase inhibitors (NNRTIs) has proven to be effective for HIV-1-infected infants, children, and adolescents. This study will evaluate the safety, effectiveness, and dosing levels of the NNRTI rilpivirine (RPV) when given with two other ARV drugs in treatment-naive, HIV-1-infected children less than 12 years of age.