Clinical Trial, Open-label, Randomised, in Order to Compare the Quality of Life for Those VIH+ Patients That Start With Monotherapy on LPV/r Tablets Vs. Triple Therapy With a Boosted Protease Inhibitor

Inclusion Criteria: * Patients infected with HIV-1, documented with a positive HIV-1 antibodies test and/or positive PCR confirmed for HIV-1 RNA. * Patients on triple antiretroviral therapy with any boosted protease inhibitor. * Patients with an undetectable viral load, which will be defined as \<50 viral RNA copies/mL within the last six months. * Men or women aged≥18. * For women with childbearing potential, negative urine pregnancy test during the Screening visit. * Patients who would have granted a written informed consent prior to any Study-specific screening procedure. Exclusion Criteria: * Patients with a written proof of resistance in the accumulated genotype, which would lead to a sensibility loss to lopinavir/ritonavir, or, in case of genotype absence, a documented failure to a protease inhibitor therapy. * Patients with a CD4 cells nadir CD4 \<100 cell/microL. * Patients who, for any reason, could not be treated with lopinavir/ritonavir. * Prior medical history of psychiatric disorders, such as depressive syndrome, schizophrenia or psychotic disease. * Known previous medical history of drug abuse/addiction or alcohol chronic consumption, which in the Investigator's opinion, would be incompatible with his/her Study participation. * Pregnant or breastfeeding women, or women of childbearing potential who do not use an appropriate contraceptive method, according to the Investigator's opinion. * Documented past(within four weeks prior to screening) or active current opportunistic infection. * Patients who, due to severe toxicities related to any of their current HAART compounds, there is a planned discontinuation or modification concerning any of the drugs from their triple therapy. * Patients for which, according to the Investigator, will have to change their HAART, regardless of the reason, within the next six months. * Renal disease with creatinine clearance \<60 mL/min. * Concomitant use of Lopinavir/ritonavir contraindicated drugs, such as rifampicin, dihydroergotamine, ergotamine, methylergonovine, cisapride, hypericum perforatum, lovastatin, simvastatin, pimozide, midazolam and triazolam. * Concomitant use of nephrotoxic or immunosuppressor drugs. * Patients currently treated with systemic corticosteroids, interleukine-2 or chemotherapy. * Patients treated with other Investigative Medical Product. * Patients with acute hepatitis. * Any disease or condition that, according to the Investigator, would be incompatible with the patient's participation in the Study.