running windows 7 Home premium service pack 1 Medion Laptop 32 bit
Arduino IDE 1.6.3
"PORT" grayed out. The IDE trying to compile on COM1, my Arduino uno was configured at install on port COM4. Shows in device manger OK
This worked for me
I downloaded the FTDI drivers from http://www.ftdichip.com/Drivers/VCP.htm
installed, all working, including option to select port - Not nice when things dont work out the Box!!!