I have had fibre broadband installed at home where I have a desktop and a laptop, both on Win7 64-bit. On wireless internet connection to the BT Hub (UK), there is no problem at all on the Internet. However, as the Desktop PC is a little distant from the hub, I installed an ethernet connection. (Speedtest shows that gets about 75Mbps download, 18Mbps upload, compared with 15/14 Mbps on my wireless connection.
Problem is, when on wired connection, only about 70% of my 'Favourites' connect, but once on a site, I can rarely click more than one or two 'links'. Windows diagnostics says "remote computer is not responding to connections on Port 80 (Firewall or Security Policy settings?). Firewall on your computer is OK."
I use Windows Firewall and Microsoft Security Essentials. Have also tried alternative ethernet cables. ISP helpdesk says he hasn't encountered this before!
Anyone got any ideas?