Pilot Study With Isentress (Raltegravir) and Epzicom (Abacavir/Lamivudine) in Treatment Naive HIV-Infected Subjects

* This is a single-arm, multicenter, open-label, pilot study to evaluate the efficacy, safety, and tolerability of RTG BID and ABC/3TC QD. A total of 30 subjects will be enrolled at 3 U.S. sites. * The study includes a 30-day screening period, a treatment period (baseline through week 48), and a follow-up visit, 2 to 4 weeks after the last study visit, as needed to resolve any ongoing AEs or to confirm virologic status. Virologic failure (VF) is defined as having either virologic non-response or virologic rebound. Virologic failure is confirmed by having 2 consecutive plasma HIV-1 RNA levels taken at least 2 weeks apart according to the following definitions: * virologic rebound is defined as HIV-1 RNA level ≥400 copies/mL after initial response of HIV-1 RNA \<400 copies/mL or \>1 log10 copies/mL increase above nadir; * virologic non-response is defined as HIV-1 RNA \>400 copies/mL at week 24. * Subjects will be discontinued from the study if virologic failure is confirmed. When a subject is suspected to have virologic failure, a confirmatory HIV-1 RNA must be performed at an unscheduled visit between 2 weeks and 4 weeks after the initial assessment, and a plasma sample collected for resistance testing. * Subjects who experience symptoms consistent with a clinically suspected ABC HSR must permanently discontinue ABC/3TC, and will be allowed to substitute study-provided fixed-dose combination ZDV/3TC 150/300 mg (COMBIVIR®) BID for ABC/3TC and remain in the study.