My computer is being bombarded by requests from 4 IPs, all start with 25

My Norton 360 and Comodo firewall requests are going crazy, with constant requests from 4 IPs. I've looked them all up, and all of them say they are located in the British Department of Defense. Most of them have been attempting to come through System on port 137, but over the past hour and a half, it's gone crazy. What did I do, and what do I do about this?!