The Safety and Effectiveness of Indinavir Plus Ritonavir Plus Two NRTIs in HIV-Infected Patients Who Need Early Intervention Treatment

Inclusion Criteria Patients may be eligible for this study if they: * Are HIV-positive. * Are 18 years of age or older. * Have a CD4 cell count of at least 50 cells/mm3. * Have a viral load (level of HIV in the blood) of at least 400 copies/ml but no more than 20,000 copies/ml. * Have had an initial response to protease inhibitor therapy with a viral load of less than 400 copies/ml in two consecutive tests at least 1 week apart. * Have been on anti-HIV (antiretroviral) treatment including indinavir or nelfinavir for at least 16 weeks. * Have had virologic failure (two consecutive viral loads that were greater than or equal to 400 copies/ml and less than or equal to 20,000 copies/ml at least 1 week apart) that is not due to another infection, vaccination, or a temporary stop in treatment. * Are naive to at least one of the selected NRTIs.