Computer regularly trying to hijack me--should I manually block a port?

As the title says, I am frequently assaulted by the same computer (IP address is always the same) trying to infect me or whatever they heck they want to do.

 

The attack is always the common Portscan and they target UDP Port 53.

 

Based on the frequency of these attacks, is there something I can do to make myself off the radar or is it a problem I'm saddled with that Norton thankfully blocks?