Hi I'm trying to open R 2.15.3 from Gretl, but I get the message "Failed to an external command". When I worked with my old Windows XP I had the same problem and the list suggested me, with older R versions, to look for the file RSetReg and doing dobule-click in it the problem was solved. I have seen that for Windows 7 the suggestion was the same, loogking for the RSetReg in C\program files\R\R-2.15.3\bin\x64,...but when I done doble-click the problem...was not solved.... I don't know if the problem is the current R version...or I'm doing something wrong. Any idea about how to solve?? Thanks in advance José Perles University of Alicante