I've installed it on my Dell Inspiron 1100 laptop, and when I run it I get the error message After typing in at IDL> openr,1,'star1.txt' " %OPENR: Error opening file.Unit:1, File: C:\RSI\IDL55\star1.txt The system cannot find the file specified." %Execution halted at: $MAIN$ The file I'm trying to run is a very basic text file and it';s attached I have tried both XP Home Edition and Win2000 Server with the same results. I have tried this on my home desktop which is a PII 350 clone running Win98 with the same resuts. I installed it on C:\RSI\IDL55\...etc On a printd I get Current Directory: C:\RSI\IDL55 %Error occurred at: PRINTD 40 C:\RSI\IDL55\lib\printd.pro % $MAIN$ % Execution halted at: $MAIN$ Any suggestions would be greatly appreciated Thanks George Conidis