Fosamprenavir Versus Other Protease Inhibitors

Inclusion Criteria:

- Be on your first protease inhibitor (PI) containing regimen, and the regimen must
consist of a PI +/- ritonavir and 2 Nucleoside/Nucleotide Reverse Transcriptase
Inhibitors (N[t]RTIs).

- Have a plasma HIV-1 RNA level (viral load) at screening of less than 400 copies/mL,
for at least 3 months prior to Screening and at Screening while on your current
regimen of a PI +/- ritonavir + 2 N(t)RTIs.

- Females must not be pregnant or breastfeeding or plan to become pregnant during the
study.

- Females of child-bearing potential must agree to use one of the approved methods of
birth control.

Exclusion Criteria:

- Not able to follow the medication schedules and attend the study visits for the
entire length of the study.

- Have any other illnesses, laboratory test results, medication use, allergies, or
medical conditions that would make it unsafe for the subject to participate in this
study.

- Currently be enrolled in any other research studies that could affect the
subject''''s HIV-1 RNA levels.