The aim of this study is to prove the efficacy of peginterferon in HIV infected patients with liver disease caused by hepatitis C virus (HCV) when the treatment to eradicate the virus failed. This scientific proof needs a comparative study to be done including two groups of patients randomly allocated: one with the treatment (peginterferon) and the other without any treatment against HCV with a duration of 2 years. To conclude, two liver biopsies are needed; one before the study and a second 2 years after.