<qa>  How many groups of patients will contain capravirine?This is a 48 week study for HIV-infected patients who have failed several regimens including PIs, NNRTs and NRTIs. Patients will be randomly selected to be in 1 of 4 groups. Three of the 4 groups will contain capravirine in different doses combined with Kaletra and nucleosides and one of the groups will be a combination of Kaletra and nucleosides without the capravirine. 