You're using cgminer 3.2.1. It doesn't work with the UART driver (it's what makes it show up as a COM port). Use 3.1.1 and you should be fine.
If you want to use 3.2.1, you'll have to uninstall the UART driver. Rumor has it this doesn't work properly if you have it plugged into a USB 3.0 port. I haven't tried it yet, took too long for me to recover from trying 3.2.0.

M