Thanks Jim, I tried ...;C:\Program Files\R\R-2.15.1\bin\x64 and ...;C:\Program Files\R\R-2.15.1\bin\x64\ I still receive the same error message. Thanks w -- View this message in context: http://r.789695.n4.nabble.com/Help-from-DOS-Command-Prompt-tp4637557p4637598.html Sent from the R help mailing list archive at Nabble.com.