HAART is considered to be the most effective treatment for HIV. However, sustained and consistent adherence to HAART is necessary for long-term success. Issues such as memory problems, lack of social support, medication side effects, depression, and substance abuse can significantly reduce patient adherence to HAART. This study will evaluate the effectiveness of a managed problem solving strategy to increase HAART adherence in patients with HIV. Both treatment-naive and treatment-experienced participants will be recruited for this study.