This study will continue to treat and collect safety and efficacy data on patients who participated in Glaxo-Wellcome's multi-center study on combination therapy with abacavir, amprenavir and efavirenz (A Phase II Study Evaluating the Safety and Antiviral Activity of Combination Therapy with 1592U89, 141W94 and DMP 266 (Sustiva) in HIV-1 Infected Subjects with Detectable [greater than 400 Copies/mL] HIV-1 Plasma RNA Despite Treatment with a Protease Inhibitor-Containing Regimen).