The purpose of this study is to investigate the pharmacokinetics (how the drug is absorbed into the bloodstream, distributed in the body and eliminated from the body) after a single dose and after repeated administration of TMC278 administered once daily for 11 days in subjects with mild or moderate hepatic impairment (impaired liver function), compared with healthy control subjects. Furthermore the short-term safety and tolerability (how well the body tolerates the drug) of TMC278 will be assessed.