 There are few randomized clinical trials in advanced HIV patients. This is a multicenter, randomized, open clinical trial, comparing 2 parallel groups, to compare the immunological reconstitution and the virological efficacy and safety of 2 different combinations of antiretroviral therapy given once a day QD: abacavir plus lamivudine plus either dolutegravir, or darunavir-ritonavir during 96 weeks in advanced antiretroviral naïve HIV-1 infected patients with less than 100 CD4 T-cellsmm3. Primary endpoint is the median increase in CD4 T-cell count at 48 weeks after starting HAART. 