To demonstrate that the antiviral activity and safety/tolerability of a test regimen of indinavir is equivalent to that of a control regimen of indinavir when each is coadministered with zidovudine (ZDV) (or stavudine, d4T) and lamivudine (3TC) for 24 weeks to protease inhibitor- and 3TC-naive HIV-1-seropositive patients. To characterize the steady-state pharmacokinetic profiles of indinavir, ZDV (or d4T), and 3TC in the presence of each other, for both the control and test regimen groups.