THE SAME EXE FILE WORKS IN ONE COMPUTER NICELY BUT WHEN I TRY TO COPY TO OTHER COMPUTER & RUN IT,IT CLOSES BY GIVING ERROR.ERROR IS IN LVRT.DLL FILE MOSTLY.ASKS ME TO REPORT TO MICROSOFT FOR THAT ERROR.

I WOULD BE GLAD IF SOMEBODY COULD HELP ME OUT SETTING THIS FILE UP IN OTHER COMPUTERS.

The login issue may be related to priveleges that your colleague has and that you don't. There may be some folder that you need read or write access to. However, without seeing the source code, it's impossible to know what folder this might be. You can try setting all NI folders for read/write access to everyone and see if that fixes anything.
The serial port issue may be that the VISA run-time engine is not installed. It could also be a problem with VISA aliases. The actual VISA resource name for com port 1 is ASRL1::INSTR. Com1 is a VISA alias. Simply installing the VISA run-time does not install the alias name. The alias can be installed by editing visaconf.ini or the program should be modified to use the actual VISA resource name.

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