This study is designed to further define the dynamics and the mechanisms of the CD4 cell rise seen following administration of potent antiretroviral therapy. It will ascertain if treatment regimens containing nucleoside reverse transcriptase inhibitors (NRTIs) with a nonnucleoside reverse transcriptase inhibitor (NNRTI) have different effects on CD4 dynamics than regimens composed of a protease inhibitor with an NNRTI.