norton internet security

A quick question. I keep getting a pop up saying Program Control, Medium Risk A remote system is attempting to access your computer. It gives me the time, date Protocol UDP (inbound) remote address an local address. It asks what do you want to do. Options permit always (recommonded), permit once, block once block all or manually configure internet access. I am running IE 7 beta, windows xp pro. This has just started recently. I tried virus scan, mothing was picked up, ran ad aware still keeps coming back. Any help, would be appreicated.

 

Up date: it keeps giving me a different remote address.