Bone, Immunologic, and Virologic Effects of a Antiretroviral Regimen

The main purpose of this study was to compare the effects on bones of the following two drug combinations: * maraviroc (MVC), emtricitabine (FTC), plus darunavir/ritonavir (DRV/r) * tenofovir (TDF) plus emtricitabine (FTC) plus darunavir/ritonavir (DRV/r) Additional study objectives were the following: * To see how the drug combinations affect the brain and kidneys. * To see how well the drug combinations lower the HIV viral load. * To see how safe the drug combinations are, how well people are able to take the study drug combinations, and how well their immune systems respond to the study drugs.