ARM A: Final dose combination (FDC) Zidovudine (ZDV)/Lamivudine (3TC). ARM B: Nevirapine (NVP). ARM C: Indinavir (IDV). ARM D: FDC ZDV/3TC plus NVP plus IDV. The initial regimen is maintained over the first 72 hours and blood for viral dynamic evaluations collected while patients are maintained as inpatients. Then, patients in Arms A, B, and C initiate FDC ZDV/3TC plus NVP plus IDV.