Does this problem still exist if you turn off your windows firewall? Start->Settings->Control Panel->Windows Firewall
Temporarily turn off the firewall. (Remember to turn it back on when you are done!) I would'nt expect that your anti-virus program would be able to block your internet access, but I don't know exactly which program you have. Most issues like the one you are having are firewall issues.
Hi i have norton antivirus and a year ago i installed it onto my computer and a while back i must have stopped it from allowing me use to the internet, so everytime i logged on my comp i had to switch it off for me to use the internet, i have renewed it thinking it wil allow me access now but nope still not, i have permitted all internet activity in the firewal but it stil blocks it, i asked a guy briefly in a pc shop i know ndhe said i need to master reset it, anybody have any idea what i should do and how i do this please thanks.