Norton Antivirus 11.0.1 and APR Cache Poison

I have NAV 11.0.1 installed on my Macbook running OS X 10.4.  For the longest time I had notifications turned on and until recently would get an occassional arp cache poison, that is until recently where my computer is getting bombarded and doesn't actually work on the wifi in the office now.  Im running a virus scan to make sure it isn't some type of virus.  I read through the other forums here and they were no help.

 

Any thoughts?  I've had over 280 attacks in the last hour and 30 minutes