The alert notice points to a Tidserv rootkit infection on your system. Blocking the IP address will be of limited value. Please register and post to one of the following free malware removal forums, that have been suggested here by delphinium. They are staffed by experts who can help you find and remove this threat. Be sure to mention Tidserv in your post.
Unfortunately, I have no idea what a "rootkit infection" is.
I don't like the idea of paying every year for Norton to protect me from something like this, then have to go to some freeware site to correct what I've already paid for.
But I guess I don't have any choice.
Once again, thanx to you two for giving the information to compensate for Norton's shortcomings.
The attacking computer is actually responding to call outs from the Tidserv infection, which is most likely attempting to connect to servers in order to download more malware such as Trojan.Zefarch!gen4. That is what these things do. If you block the one IP address, the infection will simply switch to a server at a different address.
Unfortunately, no antivirus program can make you bulletproof. The malware writers are not sitting idly by. Everyday they churn out new variants that can temporarily evade detection by security software. The forums I suggested are your best and easiest solution, as a trained person experienced in removing these sorts of infections will guide you through the removal process and make sure that your machine is clean.