I ran through the same issue and I found that I was sharing Internet Connection between LAN and Hotspot. So to solve this follow the steps below -
Solution 1 - Most possible solution
Go to Control Panel -- > View Network Connections --> Right click on your connected network and click on properties.
A new pop up window appears. in that window select sharing tab and disable network sharing.
This will release the port and you can start your activemq after that.
In case solution 1 does not work then-
Open Command Prompt and run netstat -a -o -n.
- Find the process which is running against the port 61616.
- Now kill the process from Task maager.