Children and adolescents currently enrolled in PACTG 219C will be randomly selected for this study, which will last for 48 weeks. At entry, participants will undergo neuropsychological evaluation, including academic achievement, attention, memory, language comprehension, and behavior assessments, and complete a health beliefs questionnaire. Both the participants and their parents or primary caregivers will complete questionnaires at study entry and Weeks 24 and 48. Adherence will be evaluated from self-reported and pill count measures (Weeks 4 and 24) and the PACTG 219C Adherence Module (Weeks 24 and 48).