The purpose of the study is to determine the safety, tolerability and plasma pharmacokinetics (pk) (i.e., the levels of TMC558445 circulating in your blood over time) of increasing single oral doses of TMC558445 and of multiple increasing oral doses followed by a single dose of TMC310911 to assess the potential boosting effect on the latter compound. In this study, two investigational new drugs are involved, TMC558445 and TMC310911.