Network Connection problems & Communication Errors

I have been trying to Install the Windows Live One Care Anti virus software

for a week now. I keep getting an error message saying that there is an

network connection problem try again, however the internet connection is

good. I have tried the suggestions in the Help webist but they did not seem

to help. I also installed Publisher 2007 trial version and it won't

activate. I am recieving a message indicating that there is a communication

problem when I try to activate it over the internet. There seems to be

something that is not recognizing my internet connection. can someone please

tell me what to do. I am frustrated and have contacted Windows Live Ine care

as well as my ISP and there seems to be no solution.