Patients receive indinavir bid plus ritonavir bid, plus 2 NRTIs bid (2 new NRTIs or 1 new NRTI and 1 NRTI without evidence of resistance). CD4 cell counts and plasma viral RNA are measured every 4 weeks for the duration of the study. Physical examination and laboratory tests of blood and urine are performed every 4 weeks for the duration of the study. Chest x-ray and 12-lead ECG are done prestudy.