A Study to Compare Two Different Anti-HIV Drug Regimens

This study compares 2 different anti-HIV drug regimens to determine which is the most effective in lowering the amount of HIV in the blood. The anti-HIV drugs used in this study are 2 protease inhibitors (nelfinavir and ritonavir), 2 nucleoside reverse transcriptase inhibitors (stavudine and didanosine), and 1 nonnucleoside reverse transcriptase inhibitor (nevirapine). These drug combinations have been previously studied in adults, but there is limited information on how well they work in HIV-infected children. It is important to develop drug combinations which are effective at suppressing the HIV virus in children.