Sometimes the increase in a patient's viral load (the level of HIV in the blood) can be slowed or stopped by taking anti-HIV drugs. This does not always happen. Sometimes anti-HIV drugs work at first but then stop working. When most of the usual anti-HIV drugs no longer seem to work, the virus is called multidrug-resistant (MDR). This study will compare 2 treatment plans to try to increase the effects of anti-HIV drugs in patients with MDR virus.