There is a system wide installation for the university computer of r and Rcmdr (R-Commander) There a a few computer with the following message the user tries to open an excel sheet with R.Commander: (I assume the german message is from the german operating system win 7) > library(RODBC, pos=15) Warning in odbcDriverConnect(con, tabQuote = c("[", "]"), ...) : [RODBC] FEHLER: Status IM002, Code 0, Nachricht [Microsoft][ODBC Driver Manager] Der Datenquellenname wurde nicht gefunden, und es wurde kein Standardtreiber angegeben Warning in odbcDriverConnect(con, tabQuote = c("[", "]"), ...) : ODBC connection failed Error in sqlTables(channel) : first argument is not an open RODBC channel I do not know what the difference of the Computers systems could be. Any hint for me? I am not able to reproduce this error with my Win 7 computers... Regards Knut