Any computer experts out there?

Im trying to update the firmware on my intravee, but according to bimmernav I need to change the COM port in my laptop which is running Vista Home.
I cant find the Com Port under device manager.
Any input will be appreciated

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2007 E60 M5...Loaded like a baby's diaper.
2000 Yamaha R1
2006 E53...Sold
2008 550i...R.I.P.
2001 Honda S2000...Sold
1998 BMW 318ti...Sold