The purpose of this study is to provide early access of TMC125 to HIV-1 infected patients who have failed multiple antiretroviral (ARV) regimens. Information on safety and tolerability aspects of TMC125 in combination with other ARVs in treatment-experienced HIV-1 patients with limited treatment options will be assessed. Available data regarding the effectiveness of the drug will also be collected. To be eligible, patients should be failing their current ARV regimen or be on a treatment interruption, should have previously received 2 different protease inhibitor (PI) containing regimens and be at least 3-class experienced (protease inhibitors \[PI\], nucleoside/tide reverse transcriptase inhibitors \[N\[t\]RTIs\] and non-nucleoside reverse transcriptase inhibitors \[NNRTIs\]) or at least 2-class experienced (PIs and N\[t\]RTIs) with primary NNRTI resistance. TMC125 will be administered in combination with an investigator-selected background of additional ARVs from the list of allowed medications.