Intrusion attempts and attacks... help!

Hello:

 

I'm running NAV (don't think it's the 2010 version) on WIndows XP. For a good week or so, perhaps longer, I've been getting barraged daily with pop-up messages from Norton's telling me a recent intrusion attempt has been blocked, or a recent attack on the computer has been blocked.

 

Here's a screenshot of my history. There are a TON of entries like this. What can I do?

 

5964i4934A6162F5A7BD2

 

<<Edit: Removed the IP address of the Customers computer>>