Com access denied

Hey,

I am trying to use the xbee with the arduino fio. Everytime I try to upload to the bored I get an error message saying that com port access is denied. I have tried switching com ports but that has not helped. I followed this tutorial but it has not helped
https://www.arduino.cc/en/Main/ArduinoBoardFioProgramming

If anyone has had this problem please let me know. I have been banging my head against a wall for days trying to figure this out.

Thanks!