360 cannot connect to symantic web site, but internet works fine for all other web sites?

I have 6 computers on my home network. They share an internet cable connection through a Lynksys router. I have been running Norton 360 on each of them.

One computer suffered infection and the entire Norton 360 program vanished on that computer.

I loaded a fresh install of 360. I had trouble installing because a previous version of Norton antivirus remained on the computer. I then had trouble removing Norton antivirus. I reinstalled the antivirus from old discs and then removed it.

I finally installed 360, when I went to activate it, it would not connect to the Norton server. I am able to access the web, it seems I can go to any site except Norton. The same thing happens when I attempt to run liveupdate. 

What do I do now?