Efficacy Study to Evaluate the Effect of New Antiviral Drugs on HCV Infection.

Inclusion Criteria: * Female between 18 and 35 years of age at the time of Screening * Childbearing potential and sexually active with male partner(s) currently using at least one effective method of birth control at the time of screening and two effective methods of birth control while receiving study drugs, starting with Study Day 1 and for 7 months after stopping study drug. * Females must have negative results for pregnancy tests * Chronic HCV-infection prior to study enrollment * Screening laboratory result indicating HCV GT 1b or GT 1a or GT 4 infection. * Must be able to voluntarily sign and date an informed consent form * Liver biopsy within 24 months prior to or during screening demonstrating a Metavir score of 2 or less or an Ishak score of 3 or less or Screening FibroScan® result of ≤ 9.6 kPa; Exclusion Criteria: * Women who are pregnant or breastfeeding * Positive test result for HBsAg and HIV Ab * Recent history of drug or alcohol * HCV genotype performed during screening indicates more than 1 subtype or co-infection with any other genotype. * Use of medications contraindicated * Use of known strong inducers of cytochrome P450 3A (CYP3A) or strong inducers of cytochrome P450 2C8 (CYP2C8) or strong inhibitors of CYP2C8 * History of solid organ transplant. * Confirmed presence of hepatocellular carcinoma * Current use of any investigational or commercially available anti-HCV agents * Screening laboratory analyses showing any of the following abnormal laboratory results