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1  Using Arduino / Interfacing w/ Software on the Computer / Re: Arduino UNO serial port and Perl on: October 07, 2012, 08:44:23 am
It could happen that plugging the USB cause the allocation of a new COM instance, under Windows. 
If so, you have to check what COM is using Arduino, once plugged, rather than forcing your choice ("COM7") before connection.
I'm also a newbie, but I hope this could help you. In any case, wait also for more expert suggestions! smiley
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