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Hi Allan.
A long, long time ago I had problems with a serial port, and it turned out there was some other application "using" the port. It wasn't using it in the sense of doing something, but waiting for something to happen (like a terminal emulation program waiting for signals to appear on the serial port or a modem to be connected). Since this program had control of the port, no other program could access it. It drove me nuts until I found out which process was doing it, and stopped it from loading. I can't remember what it's name was now, but I'd go through the list of processes in task manager, and see if any likely program is there.
Good luck.
Noel
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