> The program tell me that version 1.8 is required and I have only 1.5.1 > version. You're using a version of R that is roughly 2 years old. You need to update your R installation. > There is a command for installing packages with the version 1.5.1? Not really. The 1.0 release of Bioconductor worked against 1.5.X, but again, that was 2 years ago. -J