Patients will be randomized to receive 1 of 3 study regimens: Group A - Saquinavir (SQV) sgc plus 2 new reverse transcriptase inhibitors (RTIs), Group B - SQV sgc plus delavirdine plus new RTI, and Group C - SQV sgc plus nelfinavir plus new RTI, or SQV sgc plus ritonavir plus 2 new RTIs.