Differences Between Women and Men Taking a Combination of Indinavir, Ritonavir, Enteric-Coated Didanosine, and Stavudine Who Previously Took Anti-HIV Drugs

Inclusion Criteria Patients may be eligible for this study if they: * Are HIV-positive. * Have viral load (amount of HIV in the blood) greater than 500 copies/ml. * Have received anti-HIV treatment previously with an NNRTI plus an NRTI combination or only NRTIs for greater than 8 weeks and, if not currently on treatment, have been off treatment for 12 weeks or less. * Failed to keep their viral load low during previous anti-HIV treatment. * Are at least 18 years of age. * Agree to use an effective barrier method of birth control. Exclusion Criteria Patients will not be eligible for this study if they: * Have used a protease inhibitor for more than 14 days. * Have used ddI or d4T for more than 30 days. * Are pregnant or breast-feeding. * Have an opportunistic (AIDS-related) infection requiring treatment at the time of enrollment. * Have, or appear to have, peripheral neuropathy (a painful condition affecting the nervous system) at the time of screening. * Are at risk for, or have had, pancreatitis (disease of the pancreas). * Have difficulty absorbing medications. * Have a cancer, other than Kaposi's sarcoma, that may require systemic treatment. * Have any medical condition or treatment that may cause a rise in viral load. * Have any other condition or previous treatment that would interfere with the study. * Are unable to take drugs by mouth. * Are receiving or have received recently any of the following drugs: terfenadine, astemizole, cisapride, triazolam, midazolam, ergot alkaloids, amiodarone, bepridil, flecainide, propafenone, quinidine, pimozide, rifampin, and intravenous (IV) pentamidine. * Are receiving vincristine, thalidomide, foscarnet, or cisplatin or other medications that may cause nerve damage. * Have received any experimental drug within 30 days prior to treatment. * Are receiving treatment with testosterone, anabolic steroids, growth hormone, or megestrol acetate, except for certain hormonal problems.