In this multicenter, open-label study patients receive a combined drug regimen of indinavir, stavudine, and lamivudine over 48 weeks. Patients are evaluated at Weeks 0, 2, 4, every 4 weeks until Week 24, and every 8 weeks thereafter until study completion. [AS PER AMENDMENT 4/27/99: The study has been extended for an additional 48 weeks for a total of 96 weeks.]