Arm A: Indinavir plus ZDV plus 3TC. Arm B: Indinavir (test dose) plus ZDV plus 3TC. NOTE: d4T may be substituted for zidovudine for toxicity management. Patients are stratified based on prior use of nucleoside analogs (naive vs experienced to ZDV, dideoxyinosine [ddI], dideoxycytidine [ddC], and d4T) and screening viral RNA results (lower than 50,000 copies/mL vs more than 50,000 copies/mL).